American Mathematics Competitions
                   2009 AMC 10 A Results for Iowa                       
                          GRAND STATISTICS  

      TOTAL NUMBER of official students taking exam:   1415

      Number of unofficial participants:          0

      Average score of participants:           61.0

      Average score for female students  is:   57.6  (   616 Students)
      Average score for male students is:      63.4  (   668 Students)
      Average score for unspecified gender is  64.9  (   131 Students)
      Average score for grade 10 is:           61.8  (   625 Students)
      Average score for grade 9 is:            59.2  (   614 Students)
      Average score for grade 8 and below is:  64.0  (   126 Students)
      Average score with unknown grade:        65.6  (    50 Students)

        AIME qualifying score =  120.0 or better
        Number of AIME qualifers                  4

        Number of schools returning results      39
        Average school winning score           90.54


                   American Mathematics Competitions
                   2009 AMC 12 A Results for Iowa                       
                          GRAND STATISTICS  

      TOTAL NUMBER of official students taking exam:   1411

      Number of unofficial participants:          0

      Average score of participants:           60.8

      Average score for female students  is:   57.4  (   579 Students)
      Average score for male students is:      63.7  (   726 Students)
      Average score for unspecified gender is  59.9  (   106 Students)
      Average score for grade 12 is:           62.8  (   484 Students)
      Average score for grade 11 is:           59.8  (   707 Students)
      Average score for grade 10 is:           60.5  (   138 Students)
      Average score for grade 9 is:            57.4  (    51 Students)
      Average score for grade 8 and below is:  88.0  (     3 Students)
      Average score with unknown grade:        56.8  (    28 Students)

        AIME qualifying score =   97.5 or better
        Number of AIME qualifers                 35

        Number of schools returning results      47
        Average school winning score           85.98
        Average school team score             234.32
 


                   American Mathematics Competitions
                   2009 AMC 10 B Results for Iowa                       
                          GRAND STATISTICS  

      TOTAL NUMBER of official students taking exam:    251

      Number of unofficial participants:          0

      Average score of participants:           63.9

      Average score for female students  is:   57.0  (    94 Students)
      Average score for male students is:      69.7  (   135 Students)
      Average score for unspecified gender is  57.8  (    22 Students)
      Average score for grade 10 is:           65.1  (    92 Students)
      Average score for grade 9 is:            59.8  (   124 Students)
      Average score for grade 8 and below is:  86.1  (    20 Students)
      Average score with unknown grade:        60.7  (    15 Students)

        AIME qualifying score =  120.0 or better
        Number of AIME qualifers                  8

        Number of schools returning results      13
        Average school winning score          105.46


                   American Mathematics Competitions
                   2009 AMC 12 B Results for Iowa                       
                          GRAND STATISTICS  

      TOTAL NUMBER of official students taking exam:    407

      Number of unofficial participants:          0

      Average score of participants:           61.9

      Average score for female students  is:   56.1  (   130 Students)
      Average score for male students is:      70.1  (   161 Students)
      Average score for unspecified gender is  57.2  (   116 Students)
      Average score for grade 12 is:           65.5  (   118 Students)
      Average score for grade 11 is:           63.4  (   147 Students)
      Average score for grade 10 is:           62.6  (    54 Students)
      Average score for grade 9 is:            93.7  (     9 Students)
      Average score with unknown grade:        50.0  (    79 Students)

        AIME qualifying score =  100.0 or better
        Number of AIME qualifers                 23

        Number of schools returning results      15
        Average school winning score           94.60
        Average school team score             268.10
 


    2009 State AMC 12  TEAM Score Distribution
    -----------------------------------------------
    score         A         B       Rank
    -----------------------------------------------
    381.0                   1         1
    379.5         1                   2
    360.0         1                   3
    358.5                   1         4
    321.0         1                   5
    316.5         1                   6
    307.5         1                   7
    297.0                   1         8
    295.5                   1         9
    292.5         1                  10
    285.0                   1        11
    279.0         1                  12
    277.5         1                  13
    271.5         1                  14
    267.0         1                  15
    265.5         1         1        16
    262.5                   1        18
    259.5         1                  19
    258.0                   2        20
    250.5         1                  22
    249.0         2                  23
    247.5         1                  25
    246.0         1                  26
    244.5                   1        27
    243.0         1                  28
    241.5         1                  29
    238.5                   1        30
    235.5         2                  31
    234.0         1                  33
    229.5         1                  34
    228.0                   1        35
    226.5         3                  36
    225.0         2                  39
    223.5         1         2        41
    216.0         1                  44
    214.5         2                  45
    211.5         3                  47
    208.5         1                  50
    202.5         1         1        51
    201.0         1                  53
    199.5         1                  54
    198.0         1                  55
    189.0         1                  56
    187.5         1                  57
    171.0         2                  58
    166.5         1                  60
    121.5         1                  61
    106.5         1                  62
 


         2009 AMC Contest Score Distributions
    -----------------------------------------------
    score      12 A      12 B      10 A      10 B
    -----------------------------------------------
    145.5                             1
    144.0                             1         1
    138.0                                       1
    136.5                                       1
    135.0         1
    132.0                   1         1         1
    129.0         1                   1
    126.0                   1                   2
    123.0         1         1
    121.5         2                             2
    120.0                   2
    118.5         2         2
    117.0         1                   1         1
    115.5         1                   3         1
    114.0                   2         3         2
    112.5         1         1
    111.0                   2         3         1
    109.5         2                   2
    108.0         1         1         8         1
    106.5         2         2         2         4
    105.0         1         3         6
    103.5         4         1         5         1
    102.0         2         1         4         1
    100.5         4         3         8
     99.0         5         2        10         1
     97.5         4         2         4         1
     96.0         3         3         8         2
     94.5        10         5        10
     93.0         6         3         5         2
     91.5         3         6        13         2
     90.0         6         5        19         2
     88.5         7         5         8         5
     87.0         8         5        13         5
     85.5        10         2        14         2
     84.0        12         5        16         1
     82.5        12         1        11         6
     81.0        12         3        26         2
     79.5        22        13        14         2
     78.0        26         8        24         5
     76.5        26         4        33         6
     75.0        25        10        25         6
     73.5        42        11        33         5
     72.0        42         7        48         3
     70.5        39         8        28         5
     69.0        51        13        36         7
     67.5        55         7        33         5
     66.0        57        14        31         8
     64.5        71         7        39         4
     63.0        78        11        43         7
     61.5        47        11        55         7
     60.0        56        10        52         4
     58.5        66         9        46         9
     57.0        50        10        44         6
     55.5        45        12        54        11
     54.0        47        20        72         9
     52.5        50        11        38         8
     51.0        41         8        47        13
     49.5        42        11        33         4
     48.0        48        11        60         9
     46.5        28         6        44        12
     45.0        34        17        29         3
     43.5        31        11        31         7
     42.0        33         7        40         5
     40.5        30         9        24         1
     39.0        20        10        30         4
     37.5        20        13        18         2
     36.0        10         7        32         4
     34.5         7         4        11         3
     33.0         8         6        15         5
     31.5         3         6         7         1
     30.0        11         3        12         2
     28.5         7         4         6         3
     27.0         3         2         1
     25.5         2         1         1
     24.0         8         1        10         2
     22.5                             1
     21.0                   2         4         1
     19.5         3                   2
     18.0                   1                   1
     16.5         1         1         1
     13.5         1
     12.0                             2
      6.0         1                             1



                   American Mathematics Competitions
                   2009 AMC 10 A Results for Iowa                       
                         SCORE DISTRIBUTION 

    score ----gender-----------   -----------grade-----------------
            male   female    ?    <=6      7      8      9     10      ?
    ----------------------------------------------------------------------------------------
    145.5      1                                                1
    144.0             1                                         1
    132.0      1                                                1
    129.0             1                                  1
    117.0                                  1
    115.5      2                                  1      1      1
    114.0      3                                         1      2
    111.0      2      1                                  1      2
    109.5      2                                  1      1
    108.0      5                                  1      1      5      1
    106.5      1      1                                  2
    105.0      2      2                    1      1      1      2      1
    103.5      4      1                           1             4
    102.0      4                                         1      3
    100.5      5      3                           1      2      5
     99.0      5      3                    1      3      2      3      1
     97.5      3                                         2      1      1
     96.0      6      2                           3      2      3
     94.5      4      4                                  3      6      1
     93.0      2      2                                  2      2      1
     91.5      5      6                           3      4      5      1
     90.0      9      7                           1      4     10      4
     88.5      6      2                                  4      4
     87.0      8      3             1             1      5      6
     85.5     10      3                           1      6      6      1
     84.0     10      4                           3      8      5
     82.5      4      5             1             2      3      5
     81.0     18      4                    1      3     14      7      1
     79.5      5      7                    1      1      4      7      1
     78.0     16      6                           1      8     13      2
     76.5     22      9                           3     12     18
     75.0     10     13                           3     10     11      1
     73.5     19     12                    1      1     15     16
     72.0     25     20                    2      3     19     24
     70.5     10     15                    1      2     12     12      1
     69.0     18     14                           2     16     18
     67.5     12     15                           1     16     14      2
     66.0     18      9                           2     14     14      1
     64.5     19     16                           3     16     19      1
     63.0     20     19                                 23     19      1
     61.5     31     23                           2     22     29      2
     60.0     20     25                    2      3     25     19      3
     58.5     20     21                           2     17     25      2
     57.0     18     22                    1      3     17     20      3
     55.5     27     22                           3     24     26      1
     54.0     33     35                    3      3     38     27      1
     52.5     14     20                           2     20     16
     51.0     18     25                           3     26     16      2
     49.5     19     11                    1      2     21      7      2
     48.0     24     32                    1      8     21     27      3
     46.5     18     23                    1      2     23     16      2
     45.0     11     15                           2     13     13      1
     43.5     11     17                           1     19     10      1
     42.0     17     20                           3     14     21      2
     40.5      7     17                                 14     10
     39.0     12     16                           3     20      7
     37.5     10      7                           1      8      9
     36.0     13     16                    1      4     11     16
     34.5      4      6                           3      3      5
     33.0      4     10                           1      3     11
     31.5      4      3                                  3      4
     30.0      6      6                    1      2      4      5
     28.5      3      3                           1      1      4
     27.0             1                                         1
     25.5                                                              1
     24.0      3      6                           1      6      3
     22.5      1                                         1
     21.0      1      2                           1      1      1      1
     19.5      2                                         1      1
     16.5             1                                  1
     12.0      1      1                                  1      1



                   American Mathematics Competitions
                   2009 AMC 10 A Results for Iowa                       
                              Analysis      


                   Table of Item Difficulty for the 2009
              American Mathematics Competitions 10/12
           Tabulation of responses for all Participants
                             Percent of Responses


    ITEM    A         B         C         D         E       OMITS       ?
    ____  _____     _____     _____     _____     _____     _____     _____

      1    0.35      0.35      0.78     10.25     87.92*     0.35      0.00
      2   90.04*     1.70      1.34      1.20      2.54      3.18      0.00
      3    3.18     13.64     58.09*     6.22      3.75     15.12      0.00
      4   21.27*     8.62      5.09      5.80     18.02     41.20      0.00
      5   10.04      5.58      5.87      3.18     38.30*    37.03      0.00
      6   52.08*     3.32      8.55      3.60      1.06     31.38      0.00
      7    5.37      3.18     24.24*     3.53     35.48     28.13      0.07
      8   10.95     74.98*     2.90      1.98      1.41      7.77      0.00
      9    6.71     15.48*     6.29      4.45      1.13     65.94      0.00
     10    4.17     12.86*     6.08      9.68      1.84     65.37      0.00
     11    2.19      3.32      4.38     46.15*     0.92     43.04      0.00
     12    2.97      8.27     23.46*     7.14      8.27     49.89      0.00
     13   17.88      5.02      3.46     11.45      8.48*    53.71      0.00
     14   30.18*     1.55      5.80      5.23     14.42     42.83      0.00
     15    2.97      3.25      3.39      7.14     41.27*    41.98      0.00
     16   23.25      4.10      4.03      8.48*     4.95     55.19      0.00
     17    4.38      7.28      4.52*     1.41      3.82     78.59      0.00
     18   20.35     10.81      6.93     12.16*     6.29     43.46      0.00
     19    4.38      8.06*     5.94      6.43      1.77     73.43      0.00
     20    8.69     10.67     11.02     31.52*     1.84     36.25      0.00
     21    1.48      2.12      9.82*     2.19      2.47     81.91      0.00
     22    6.15      5.58     29.05      6.36*     2.83     50.04      0.00
     23    2.40      2.90      4.17      2.97      9.68*    77.88      0.00
     24    7.49     13.00      6.15*     2.83      5.58     64.95      0.00
     25    4.52      3.39*     4.88      3.46      3.25     80.49      0.00


   (*)  Correct Response

   (?)  Response the computer was unable to read due to incomplete
        erasures or two answers marked in the same column




                   American Mathematics Competitions
                   2009 AMC 12 A Results for Iowa                       
                         SCORE DISTRIBUTION 

    score ----gender-----------   -----------grade-----------------
            male   female    ?    <=6      7      8      9     10     11     12     13      ?
    ----------------------------------------------------------------------------------------
    135.0             1                                                       1
    129.0      1                                                       1
    123.0      1                                         1
    121.5      1      1                                                1      1
    118.5      2                                                              2
    117.0      1                                                1
    115.5      1                                                       1
    112.5      1                                                       1
    109.5      2                                                1             1
    108.0             1                                                       1
    106.5      1      1                                         1      1
    105.0                                                              1
    103.5      3                                                       1      3
    102.0      2                                         1             1
    100.5      2      1                                                4
     99.0      2      2                                                1      3             1
     97.5      4                                                       1      3
     96.0      2                                                       1      2
     94.5      8      2                           2                    3      5
     93.0      4      2                                  1             2      3
     91.5      2      1                                                1      1             1
     90.0      2      3                                                2      4
     88.5      4      3                                         3      2      2
     87.0      3      3                                                4      4
     85.5      6      4                                         1      5      4
     84.0      8      2                                         1      5      6
     82.5      9      2                                         2      5      5
     81.0      8      3                                                4      8
     79.5     17      5                                         2      9     11
     78.0     18      7                                  1      1     13     11
     76.5     19      5                                  1      5     10      9             1
     75.0     12     11                           1      1            15      8
     73.5     26     16                                         5     17     20
     72.0     29     12                                  1      4     18     19
     70.5     24     11                                  2      1     23     12             1
     69.0     37     12                                  1      6     29     15
     67.5     32     18                                  2      6     24     22             1
     66.0     28     25                                  3      8     25     19             2
     64.5     32     32                                  3      6     32     27             3
     63.0     33     36                                  1      9     41     25             2
     61.5     33     12                                         5     25     17
     60.0     30     22                                  2      4     32     17             1
     58.5     31     28                                  2      8     37     18             1
     57.0     23     26                                  2      6     28     14
     55.5     23     19                                         6     24     13             2
     54.0     22     18                                         5     27     13             2
     52.5     21     26                                  4      1     32     13
     51.0     18     19                                  3      5     21      9             3
     49.5     15     24                                  2      5     24     11
     48.0     25     22                                  1      1     28     18
     46.5     10     15                                  3      3     14      7             1
     45.0     16     17                                  2      7     17      8
     43.5      9     19                                  2      4     13     12
     42.0     18     14                                  3      3     13     13             1
     40.5     10     19                                  3      4     10     12             1
     39.0      6     11                                  1      2      9      8
     37.5      7     11                                         1     12      7
     36.0      3      6                                         4      6
     34.5      3      4                                                6      1
     33.0      4      3                                                3      4             1
     31.5             3                                                2      1
     30.0      5      4                                                8      3
     28.5             4                                                4      1             2
     27.0      1      2                                  1      1      1
     25.5             2                                                1      1
     24.0      3      4                                                2      5             1
     19.5      1      2                                  1             2
     16.5      1                                                              1
     13.5      1                                                       1
      6.0             1                                                1



                   American Mathematics Competitions
                   2009 AMC 12 A Results for Iowa                       
                              Analysis      


                   Table of Item Difficulty for the 2009
              American Mathematics Competitions 10/12
           Tabulation of responses for all Participants
                             Percent of Responses


    ITEM    A         B         C         D         E       OMITS       ?
    ____  _____     _____     _____     _____     _____     _____     _____

      1   83.49*     7.80      1.13      0.71      1.98      4.89      0.00
      2    1.20      8.22     73.85*     5.53      3.33      7.80      0.07
      3    7.16     69.31*     5.10      7.09      2.41      8.93      0.00
      4   93.91*     1.20      0.71      0.92      1.28      1.98      0.00
      5    1.49      1.91      3.05     68.04*     1.28     24.24      0.00
      6   20.98      5.67      2.06     13.89     19.84*    37.56      0.00
      7    1.06     12.12*     4.96      3.90      1.77     76.19      0.00
      8   46.63*     1.56      7.02      4.04      9.21     31.54      0.00
      9    2.83      4.04      3.90     17.65*     5.32     66.27      0.00
     10    3.26      7.58     29.06*     9.99      5.32     44.79      0.00
     11    1.91      3.19      3.40      5.46     63.78*    22.25      0.00
     12    8.50     22.68*     4.89      7.44      3.12     53.30      0.07
     13   10.56      9.78     10.42     11.34*     4.46     53.44      0.00
     14    2.62      3.83*     7.51      8.50      4.89     72.64      0.00
     15    6.45      4.68      6.59     13.75*     3.47     65.06      0.00
     16    9.92      6.24      5.39      5.24*     2.48     70.73      0.00
     17    3.69      2.83      5.88*     3.19      6.17     78.17      0.07
     18    8.15      5.24*     5.53      1.91      2.27     76.90      0.00
     19    5.74      8.65      6.02*     8.01      6.66     64.92      0.00
     20    2.98      1.28      6.09      4.46     10.35*    74.84      0.00
     21    4.32      3.76      4.11*     2.27      3.40     82.14      0.00
     22    1.98      3.40      3.05      4.46      2.62*    84.48      0.00
     23    1.63      1.98      2.76      1.98*     0.28     91.35      0.00
     24    7.30      3.12      3.05      3.12      0.99*    82.42      0.00
     25    2.48*     2.83      3.97      5.32      4.61     80.79      0.00


   (*)  Correct Response

   (?)  Response the computer was unable to read due to incomplete
        erasures or two answers marked in the same column




                   American Mathematics Competitions
                   2009 AMC 10 B Results for Iowa                       
                         SCORE DISTRIBUTION 

    score ----gender-----------   -----------grade-----------------
            male   female    ?    <=6      7      8      9     10      ?
    ----------------------------------------------------------------------------------------
    144.0             1                                         1
    138.0      1                                                1
    136.5      1                                                1
    132.0      1                                         1
    126.0      2                                  1             1
    121.5      2                                  1             1
    117.0      1                                         1
    115.5      1                                  1
    114.0      1      1                           1             1
    111.0      1                                  1
    108.0      1                                         1
    106.5      3      1                           2             2
    103.5             1                                  1
    102.0      1                                                1
     99.0      1                                         1
     97.5      1                                         1
     96.0      1      1                                  1      1
     93.0      1      1                                  1      1
     91.5      1      1                    1                    1
     90.0             1                                  1             1
     88.5      5                                         2      3
     87.0      3      2                                  3      2
     85.5      1                                  1                    1
     84.0      1                                         1
     82.5      4                                         3      2      1
     81.0      1      1                    1      1
     79.5      1      1                                         2
     78.0      3      2                                  3      2
     76.5      4      2                           2      3             1
     75.0      6                           1             4      1
     73.5      5                                         1      4
     72.0      3                                  1      2
     70.5      4      1                                  3      2
     69.0      6      1                                  4      3
     67.5      5                    1                    3      1
     66.0      3      3                                  2      5      1
     64.5      2      2                                  2      2
     63.0      2      4                                  5      2
     61.5      4      2                                  3      3      1
     60.0      3      1             1                    2      1
     58.5      4      2                                  6      2      1
     57.0      2      4                                  1      5
     55.5      2      6                    1      1      4      4      1
     54.0      4      4                                  6      1      2
     52.5      3      5                                  7      1
     51.0      4      9                                  7      4      2
     49.5      3                                         2      1      1
     48.0      3      6                                  4      5
     46.5      5      6                                  5      7
     45.0             2                                  2      1
     43.5      5      1                    1             5      1
     42.0      2      3                                  4      1
     40.5      1                                                       1
     39.0             4                                  1      3
     37.5      1      1                                  1      1
     36.0      1      2                                  2      2
     34.5      1      1                                  2             1
     33.0      2      3                                  4      1
     31.5             1                                         1
     30.0      1      1                                  1      1
     28.5      2      1                                  1      2
     24.0      1                                         2
     21.0             1                                  1
     18.0             1                                         1
      6.0      1                                         1



                   American Mathematics Competitions
                   2009 AMC 10 B Results for Iowa                       
                              Analysis      


                   Table of Item Difficulty for the 2009
              American Mathematics Competitions 10/12
           Tabulation of responses for all Participants
                             Percent of Responses


    ITEM    A         B         C         D         E       OMITS       ?
    ____  _____     _____     _____     _____     _____     _____     _____

      1    0.00     74.10*     5.18     18.33      2.39      0.00      0.00
      2    5.18      1.59     83.67*     1.20      0.80      7.57      0.00
      3    1.99      6.77     67.33*    15.94      1.59      6.37      0.00
      4    2.79      4.78     63.75*    12.75      4.38     11.55      0.00
      5   13.55      3.59     25.90     44.62*     3.98      8.37      0.00
      6    1.59      3.59      6.77     69.32*     3.59     15.14      0.00
      7   19.12     13.55     47.41*     8.76      8.37      2.79      0.00
      8    3.19     27.49*     4.38     43.03      7.17     14.74      0.00
      9   25.10*     5.18      7.17      9.56      3.59     49.40      0.00
     10   15.14      3.19      5.18      4.78     29.48*    42.23      0.00
     11   64.14*     7.17      3.59      3.19      1.20     20.72      0.00
     12   17.13*    15.94      9.16     19.92     10.76     27.09      0.00
     13    2.39     12.75     43.82*     9.16      9.96     21.91      0.00
     14    4.78     29.48     19.12     19.92*     8.76     17.93      0.00
     15   11.16      6.37      4.78      8.37     43.43*    25.90      0.00
     16    3.98     10.76*     3.98      2.79      4.38     74.10      0.00
     17   25.90     18.33     16.33*     2.39      0.40     36.65      0.00
     18    3.59      6.37      9.56     11.16*     1.59     67.73      0.00
     19   27.09*    18.73     10.36     10.76      4.78     28.29      0.00
     20    6.37     14.74*     5.98      0.80      2.39     69.72      0.00
     21    5.98     11.55      4.78      9.96*     3.98     63.75      0.00
     22    1.20      3.98*     5.18      3.19      2.39     84.06      0.00
     23    8.37      8.76     10.76*     9.96      5.58     56.57      0.00
     24   14.34*     4.38      5.18      5.58      8.76     61.75      0.00
     25   21.51     10.76*     9.16      8.37      7.97     42.23      0.00


   (*)  Correct Response

   (?)  Response the computer was unable to read due to incomplete
        erasures or two answers marked in the same column




                   American Mathematics Competitions
                   2009 AMC 12 B Results for Iowa                       
                         SCORE DISTRIBUTION 

    score ----gender-----------   -----------grade-----------------
            male   female    ?    <=6      7      8      9     10     11     12     13      ?
    ----------------------------------------------------------------------------------------
    132.0             1                                  1
    126.0      1                                                       1
    123.0      1                                                1
    120.0      2                                         1      1
    118.5      2                                                       2
    114.0      2                                         1                    1
    112.5      1                                                       1
    111.0      1                                                              1             1
    108.0      1                                                1
    106.5             1                                  1             1
    105.0      2                                                1             2
    103.5      1                                                              1
    102.0      1                                                       1
    100.5      2                                                       3
     99.0      1      1                                         1             1
     97.5      1      1                                                1      1
     96.0      3                                                1      2
     94.5      2      3                                                3      2
     93.0             2                                                       3
     91.5      2      1                                                2      3             1
     90.0      2                                         2                    1             2
     88.5      2      2                                                2      3
     87.0      1      2                                                2      2             1
     85.5             1                                         1      1
     84.0      3                                                       2      2             1
     82.5      1                                                       1
     81.0      2      1                                         1      2
     79.5      9      1                                         2      7      4
     78.0      5      1                                                4      4
     76.5      4                                                2      1      1
     75.0      6      1                                                3      6             1
     73.5      4      4                                                6      4             1
     72.0      6                                                1             5             1
     70.5      5                                                1      2      3             2
     69.0      4      3                                         1      4      4             4
     67.5      2      3                                         1      4      2
     66.0      7      6                                  1      2      8      2             1
     64.5      2      4                                         2      1      3             1
     63.0      7      3                                  1      3      2      5
     61.5      4      5                                  1      1      4      3             2
     60.0      5      2                                         3      3      3             1
     58.5      4      4                                         3      2      3             1
     57.0      2      7                                         2      6      1             1
     55.5      3      4                                         2      4      4             2
     54.0     11      6                                         4     11      3             2
     52.5      8      1                                         1      4      4             2
     51.0      1      5                                                3      3             2
     49.5      1      7                                         2      4      2             3
     48.0      6      1                                         1      3      4             3
     46.5      1      3                                                1      3             2
     45.0      6      6                                         1      9      4             3
     43.5             5                                         1      3      1             6
     42.0      2      4                                         3      1      2             1
     40.5      2      1                                         2      1      2             4
     39.0      1      4                                                4      1             5
     37.5      3      6                                         3      6      1             3
     36.0      1      2                                                1      2             4
     34.5                                                                                   4
     33.0      1      2                                                3                    3
     31.5      1      3                                                1      2             3
     30.0             3                                                1      2
     28.5             1                                         1                           3
     27.0             1                                         1                           1
     25.5             1                                                1
     24.0                                                                                   1
     21.0             2                                                       2
     18.0             1                                                1
     16.5             1                                                1



                   American Mathematics Competitions
                   2009 AMC 12 B Results for Iowa                       
                              Analysis      


                   Table of Item Difficulty for the 2009
              American Mathematics Competitions 10/12
           Tabulation of responses for all Participants
                             Percent of Responses


    ITEM    A         B         C         D         E       OMITS       ?
    ____  _____     _____     _____     _____     _____     _____     _____

      1    0.49     78.13*     4.91     13.27      1.97      1.23      0.00
      2    1.72      4.42     75.68*    13.02      0.49      4.67      0.00
      3   12.29      3.69     20.15     51.35*     2.70      9.83      0.00
      4    3.19      2.46     67.08*    13.27      1.72     12.29      0.00
      5    0.25      1.47      5.65     76.41*     2.70     13.51      0.00
      6   14.00     14.50     54.30*     6.88      5.90      4.42      0.00
      7    1.97     39.07*     6.63     38.82      3.19     10.32      0.00
      8    6.14      6.88      3.19      6.14     56.51*    21.13      0.00
      9   37.35*     2.46      2.95      5.41      2.21     49.63      0.00
     10   35.63*    14.99      7.86      7.37      3.93     30.22      0.00
     11    3.69     27.27     22.60     20.88*     7.86     17.69      0.00
     12    3.69      4.42      5.65      3.44     25.55*    57.25      0.00
     13    6.39      4.42      4.91     17.69*     3.69     62.90      0.00
     14   18.43     17.44     23.10*     2.95      0.74     37.35      0.00
     15    1.72     39.07*    17.20      6.14      5.41     30.47      0.00
     16    3.69      3.44*     2.46      2.95      2.21     85.26      0.00
     17   21.62     17.44*     8.85      6.14      7.62     38.33      0.00
     18    5.65      9.83     13.51*     7.86      5.65     57.49      0.00
     19    3.19      2.70      5.65      1.47      1.97*    85.01      0.00
     20    4.18      3.19      4.91*     1.97      6.63     79.12      0.00
     21    5.16*     6.14      7.13     13.51     25.31     42.75      0.00
     22    3.19      4.18      4.91*     1.72      1.47     84.52      0.00
     23    2.46      4.18      3.69      6.14*     1.97     81.57      0.00
     24    7.13      7.62*     3.19      4.67      1.97     75.43      0.00
     25   11.55      6.39      3.69      3.44      3.69*    71.25      0.00


   (*)  Correct Response

   (?)  Response the computer was unable to read due to incomplete
        erasures or two answers marked in the same column