American Mathematics Competitions
2005 AMC 10 A Results for Idaho
GRAND STATISTICS
TOTAL NUMBER of official students taking exam: 480
Number of unofficial participants: 16
Average score of participants: 69.8
Average score for female students is: 68.1 ( 245 Students)
Average score for male students is: 71.9 ( 204 Students)
Average score for unspecified gender is 68.6 ( 31 Students)
Average score for grade 10 is: 72.1 ( 327 Students)
Average score for grade 9 is: 64.4 ( 136 Students)
Average score for grade 8 and below is: 66.6 ( 8 Students)
Average score with unknown grade: 69.4 ( 9 Students)
AIME qualifying score = 120.0 or better
Number of AIME qualifers 2
Number of schools returning results 15
Average school winning score 94.33
American Mathematics Competitions
2005 AMC 12 A Results for Idaho
GRAND STATISTICS
TOTAL NUMBER of official students taking exam: 776
Number of unofficial participants: 23
Average score of participants: 75.9
Average score for female students is: 73.7 ( 323 Students)
Average score for male students is: 77.0 ( 366 Students)
Average score for unspecified gender is 79.8 ( 87 Students)
Average score for grade 12 is: 77.9 ( 298 Students)
Average score for grade 11 is: 73.5 ( 361 Students)
Average score for grade 10 is: 75.7 ( 43 Students)
Average score for grade 9 is: 70.3 ( 5 Students)
Average score with unknown grade: 80.8 ( 69 Students)
AIME qualifying score = 100.0 or better
Number of AIME qualifers 38
Number of schools returning results 18
Average school winning score 104.86
Average school team score 280.64
American Mathematics Competitions
2005 AMC 10 B Results for Idaho
GRAND STATISTICS
TOTAL NUMBER of official students taking exam: 126
Number of unofficial participants: 0
Average score of participants: 74.1
Average score for female students is: 72.5 ( 68 Students)
Average score for male students is: 76.1 ( 54 Students)
Average score for unspecified gender is 73.8 ( 4 Students)
Average score for grade 10 is: 76.5 ( 77 Students)
Average score for grade 9 is: 74.6 ( 35 Students)
Average score for grade 8 and below is: 57.5 ( 13 Students)
Average score with unknown grade: 90.0 ( 1 Student)
AIME qualifying score = 120.0 or better
Number of AIME qualifers 0
Number of schools returning results 6
Average school winning score 96.83
American Mathematics Competitions
2005 AMC 12 B Results for Idaho
GRAND STATISTICS
TOTAL NUMBER of official students taking exam: 137
Number of unofficial participants: 0
Average score of participants: 76.7
Average score for female students is: 77.7 ( 59 Students)
Average score for male students is: 75.9 ( 74 Students)
Average score for unspecified gender is 76.4 ( 4 Students)
Average score for grade 12 is: 80.2 ( 56 Students)
Average score for grade 11 is: 74.3 ( 81 Students)
AIME qualifying score = 100.0 or better
Number of AIME qualifers 1
Number of schools returning results 6
Average school winning score 95.67
Average school team score 275.58
2005 State AMC 12 TEAM Score Distribution
-----------------------------------------------
score A B Rank
-----------------------------------------------
339.0 1 1
329.0 1 2
328.5 1 3
324.5 1 4
324.0 1 5
322.5 1 6
319.5 1 7
299.0 1 8
293.5 1 9
288.5 1 10
288.0 1 11
287.5 1 12
286.0 1 13
282.5 1 14
279.5 1 15
262.0 1 16
259.5 1 17
256.0 1 18
253.5 1 19
252.5 1 20
251.5 1 21
248.0 1 22
230.0 1 23
100.5 1 24
2005 AMC Contest Score Distributions
-----------------------------------------------
score 12 A 12 B 10 A 10 B
-----------------------------------------------
129.0 1
125.5 1
120.5 1
119.5 2
118.5 1
115.5 1
115.0 2
113.5 1
111.5 1
111.0 1 1
110.0 1
109.0 1
108.5 1
108.0 1
107.5 1 1
106.5 1 2
105.5 2 1
104.5 5
104.0 4 1
103.0 4
102.0 2 1
101.5 1 1
101.0 4 1 1
100.5 3
99.5 3 1 2 1
99.0 1
98.5 4 1
98.0 2 2
97.5 5
97.0 5 2
96.0 7 3 2
95.0 14 1 1 2
94.5 1 1 2 3
94.0 2 1
93.5 8 1
92.5 8 1 1 1
91.5 11 1 4 1
91.0 7 2 1 2
90.5 8 1
90.0 4 1 2 2
89.5 1 1
89.0 13 5 4 1
88.5 6 3 1
88.0 13 3 6 1
87.5 10 2 6 2
87.0 5 2 2
86.5 8 4 4 1
86.0 1
85.5 16 2 7 2
85.0 1 1 1 2
84.5 15 2 6 3
84.0 6 4 3 1
83.5 9 1
83.0 20 3 7 3
82.5 6 1 1
82.0 12 6 8 3
81.5 6 1 4 1
81.0 7 4 6
80.5 6 2 2 3
80.0 8 2 2 2
79.5 16 2 7 1
79.0 5 3 2
78.5 13 1 13 3
78.0 6 3 5
77.5 9 3 6
77.0 14 5 5 1
76.5 6 2 3
76.0 17 4 9 3
75.5 6 2 4
75.0 21 5 8 4
74.5 8 1 8
74.0 14 5 9 2
73.5 15 2 7 1
73.0 8 1 7 1
72.5 12 2 13 3
72.0 6 6 5
71.5 11 1 9 2
71.0 7 2 4 5
70.5 10 1 7 2
70.0 13 9 1
69.5 5 5 6 1
69.0 11 10
68.5 8 1 6 1
68.0 13 1 3
67.5 7 1 10 2
67.0 20 1 8 1
66.5 9 4 8
66.0 9 1 7
65.5 6 1 6
65.0 7 1 4 1
64.5 10 8
64.0 13 6 1
63.5 8 1 13 3
63.0 10 2 6 1
62.5 5 5 2
62.0 11 1
61.5 8 6
61.0 4 2 4 1
60.5 8 1 3 2
60.0 11 2 3
59.5 3 1 5 3
59.0 5 6 1
58.5 8 6 1
58.0 2 1 9 2
57.5 6 6
57.0 3 5
56.5 3 1 2
56.0 3 4
55.5 2 1 6
55.0 3 1
54.5 4 2 3 1
54.0 4 1 6
53.5 4 6 3
53.0 5 7 1
52.5 3 4
52.0 4 2
51.5 1
51.0 2 1
50.5 4 1
50.0 5 1
49.5 3 2
49.0 3
48.5 1 1
48.0 1 3 1
47.5 1 1 1
47.0 1
46.5 1
46.0 2 2
45.5 3
45.0 2 1
43.5 1 1
43.0 2
42.5 2
42.0 1 1 3
40.5 1 2
40.0 1 1
39.5 1
39.0 1
35.5 1
33.0 2
32.5 1
31.5 1
30.0 1 1
29.0 1
24.0 2
23.0 1
12.0 1
American Mathematics Competitions
2005 AMC 10 A Results for Idaho
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
150.0 125.0 100.0
149.5 124.5 99.5 2
149.0 124.0 99.0
148.5 123.5 98.5
148.0 123.0 98.0 2
147.5 122.5 97.5
147.0 122.0 97.0 1 1
146.5 121.5 96.5
146.0 121.0 96.0 2
145.5 120.5 95.5
145.0 120.0 95.0 1
144.5 119.5 94.5 2
144.0 119.0 94.0
143.5 118.5 93.5 1
143.0 118.0 93.0
142.5 117.5 92.5 1
142.0 117.0 92.0
141.5 116.5 91.5 1 3
141.0 116.0 91.0 1
140.5 115.5 90.5
140.0 115.0 90.0 2
139.5 114.5 89.5 1
139.0 114.0 89.0 3 1
138.5 113.5 88.5 1 2
138.0 113.0 88.0 4 2
137.5 112.5 87.5 2 4
137.0 112.0 87.0 1 1
136.5 111.5 86.5 1 3
136.0 111.0 86.0
135.5 110.5 85.5 2 4
135.0 110.0 1 85.0 1
134.5 109.5 84.5 4 2
134.0 109.0 84.0 3
133.5 108.5 83.5
133.0 108.0 83.0 4 2
132.5 107.5 1 82.5 1
132.0 107.0 82.0 5 3
131.5 106.5 81.5 1 2
131.0 106.0 81.0 1 5
130.5 105.5 80.5 1
130.0 105.0 80.0 2
129.5 104.5 79.5 4 3
129.0 1 104.0 1 79.0 3
128.5 103.5 78.5 5 7
128.0 103.0 78.0 3 2
127.5 102.5 77.5 2 2
127.0 102.0 1 77.0 4 1
126.5 101.5 1 76.5 3
126.0 101.0 76.0 3 6
125.5 100.5 75.5 2 2
American Mathematics Competitions
2005 AMC 10 A Results for Idaho
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
75.0 3 5 50.0 3 2 25.0
74.5 3 4 49.5 1 1 24.5
74.0 7 1 49.0 1 2 24.0 2
73.5 2 5 48.5 1 23.5
73.0 4 3 48.0 1 1 23.0 1
72.5 5 8 47.5 1 22.5
72.0 2 4 47.0 22.0
71.5 4 5 46.5 21.5
71.0 1 3 46.0 1 1 21.0
70.5 2 5 45.5 20.5
70.0 1 7 45.0 1 20.0
69.5 5 1 44.5 19.5
69.0 4 6 44.0 19.0
68.5 2 4 43.5 1 18.5
68.0 2 43.0 18.0
67.5 2 8 42.5 2 17.5
67.0 2 6 42.0 1 2 17.0
66.5 3 2 41.5 16.5
66.0 4 2 41.0 16.0
65.5 1 4 40.5 1 15.5
65.0 4 40.0 1 15.0
64.5 3 3 39.5 14.5
64.0 3 3 39.0 14.0
63.5 5 8 38.5 13.5
63.0 2 4 38.0 13.0
62.5 2 2 37.5 12.5
62.0 37.0 12.0 1
61.5 4 2 36.5 11.5
61.0 1 2 36.0 11.0
60.5 2 35.5 1 10.5
60.0 3 35.0 10.0
59.5 2 3 34.5 9.5
59.0 3 3 34.0 9.0
58.5 1 5 33.5 8.5
58.0 2 7 33.0 8.0
57.5 2 4 32.5 1 7.5
57.0 1 4 32.0 7.0
56.5 1 1 31.5 6.5
56.0 2 2 31.0 6.0
55.5 2 4 30.5 5.5
55.0 1 30.0 5.0
54.5 3 29.5 4.5
54.0 2 3 29.0 4.0
53.5 2 4 28.5 3.5
53.0 4 3 28.0 3.0
52.5 2 1 27.5 2.5
52.0 2 27.0 2.0
51.5 26.5 1.5
51.0 26.0 1.0
50.5 25.5 .5
0.0 0 0
American Mathematics Competitions
2005 AMC 10 A Results for Idaho
SCORE DISTRIBUTION
score -----------grade-----------
6 7 8 9 10 unknown
---------------------------
129.0 1
120.5 1
110.0 1
107.5 1
105.5 1
104.0 1
102.0 1
101.5 1
99.5 2
99.0 1
98.0 2
97.0 1 1
96.0 2
95.0 1
94.5 2
93.5 1
92.5 1
91.5 4
91.0 1
90.0 1 1
89.5 1
89.0 2 2
88.5 1 2
88.0 1 5
87.5 6
87.0 1 1
86.5 1 1 2
85.5 2 5
85.0 1
84.5 6
84.0 3
83.0 1 5 1
82.5 1
82.0 1 7
81.5 1 1 2
81.0 1 5
80.5 2
80.0 1 1
79.5 1 6
79.0 1 2
78.5 4 9
78.0 5
77.5 2 3 1
77.0 5
76.5 3
76.0 1 8
75.5 4
75.0 2 6
74.5 8
74.0 2 6 1
73.5 1 6
73.0 4 3
72.5 6 7
72.0 1 5
71.5 4 5
71.0 2 2
70.5 2 5
70.0 1 8
69.5 1 5
69.0 1 9
68.5 1 5
68.0 1 2
67.5 2 8
67.0 5 3
66.5 3 5
66.0 6 1
65.5 5 1
65.0 1 3
64.5 1 3 2 2
64.0 2 4
63.5 4 9
63.0 3 3
62.5 1 4
61.5 2 4
61.0 2 2
60.5 1 2
60.0 2 1
59.5 3 2
59.0 6
58.5 4 2
58.0 5 4
57.5 2 4
57.0 2 3
56.5 2
56.0 2 2
55.5 2 4
55.0 1
54.5 2 1
54.0 6
53.5 3 3
53.0 4 3
52.5 1 3
52.0 1 1
50.0 3 2
49.5 2
49.0 1 2
48.5 1
48.0 1 2
47.5 1
47.0 1
46.0 2
45.0 1 1
43.5 1
42.5 1 1
42.0 1 2
40.5 1
40.0 1
35.5 1
32.5 1
31.5 1
30.0 1
24.0 1 1
23.0 1
12.0 1
American Mathematics Competitions
2005 AMC 10 A Results for Idaho
Analysis
Table of Item Difficulty for the 2005
American High School Mathematics Examination
Tabulation of responses for all Participants
Percent of Responses
ITEM A B C D E OMITS ?
____ _____ _____ _____ _____ _____ _____ _____
1 0.29 0.17 0.27 8.23* 0.50 0.54 0.00
2 0.10 0.19 4.25* 0.06 1.29 4.10 0.00
3 0.04 8.42* 0.29 0.46 0.10 0.69 0.00
4 0.38 1.27* 1.60 0.60 0.42 5.73 0.00
5 4.73* 0.38 4.31 0.15 0.06 0.38 0.00
6 0.13 3.90* 3.69 0.17 0.19 1.94 0.00
7 0.67 3.29* 0.35 0.31 0.56 4.81 0.00
8 0.81 0.33 3.52* 0.15 0.17 5.02 0.00
9 1.25 5.63* 0.96 0.23 0.13 1.81 0.00
10 0.79* 0.38 0.58 0.38 0.19 7.69 0.00
11 0.42 1.19* 0.27 0.54 0.13 7.46 0.00
12 0.19 0.42* 0.35 0.15 0.46 8.44 0.00
13 1.10 0.35 0.35 0.25 0.50* 7.42 0.02
14 0.75 0.40 0.31 0.52 1.46* 6.56 0.00
15 0.29 0.90 0.71 0.52 0.38* 7.21 0.00
16 0.58 0.25 0.46 0.83* 0.19 7.69 0.00
17 0.40 0.25 0.33 1.31* 0.33 7.38 0.00
18 1.71* 1.60 1.15 2.63 0.19 2.73 0.00
19 0.27 0.50 0.85 2.52* 0.54 5.31 0.00
20 0.31* 0.21 0.35 0.44 0.13 8.56 0.00
21 1.54 0.40* 0.10 0.25 0.27 7.44 0.00
22 0.35 0.42 0.23 0.90* 0.40 7.71 0.00
23 0.19 0.40 0.79* 0.60 0.52 7.50 0.00
24 0.63 0.48* 0.21 0.08 0.13 8.48 0.00
25 0.27 0.40 0.81 0.54* 0.13 7.85 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
2005 AMC 12 A Results for Idaho
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
150.0 125.0 100.0
149.5 124.5 99.5 1
149.0 124.0 99.0
148.5 123.5 98.5 3
148.0 123.0 98.0
147.5 122.5 97.5 2
147.0 122.0 97.0 2 2
146.5 121.5 96.5
146.0 121.0 96.0 6
145.5 120.5 95.5
145.0 120.0 95.0 10 2
144.5 119.5 2 94.5 1
144.0 119.0 94.0 1 1
143.5 118.5 1 93.5 6 2
143.0 118.0 93.0
142.5 117.5 92.5 4 2
142.0 117.0 92.0
141.5 116.5 91.5 5 4
141.0 116.0 91.0 4 1
140.5 115.5 90.5 2 5
140.0 115.0 1 1 90.0 2 1
139.5 114.5 89.5
139.0 114.0 89.0 8 3
138.5 113.5 1 88.5 2 4
138.0 113.0 88.0 8 2
137.5 112.5 87.5 5 3
137.0 112.0 87.0 1 3
136.5 111.5 1 86.5 4 3
136.0 111.0 1 86.0
135.5 110.5 85.5 3 10
135.0 110.0 85.0 1
134.5 109.5 84.5 9 5
134.0 109.0 1 84.0 3 2
133.5 108.5 1 83.5 3 4
133.0 108.0 1 83.0 10 6
132.5 107.5 82.5 3 2
132.0 107.0 82.0 3 5
131.5 106.5 1 81.5 3 2
131.0 106.0 81.0 4 3
130.5 105.5 1 1 80.5 2 3
130.0 105.0 80.0 2 4
129.5 104.5 2 3 79.5 7 6
129.0 104.0 3 1 79.0 3 2
128.5 103.5 78.5 5 7
128.0 103.0 3 1 78.0 3 2
127.5 102.5 77.5 2 5
127.0 102.0 1 1 77.0 9 4
126.5 101.5 1 76.5 1 5
126.0 101.0 2 2 76.0 5 10
125.5 1 100.5 3 75.5 3 2
American Mathematics Competitions
2005 AMC 12 A Results for Idaho
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
75.0 8 10 50.0 25.0
74.5 4 3 49.5 1 2 24.5
74.0 3 10 49.0 24.0
73.5 10 5 48.5 23.5
73.0 2 6 48.0 23.0
72.5 8 3 47.5 1 22.5
72.0 3 3 47.0 22.0
71.5 6 5 46.5 1 21.5
71.0 4 2 46.0 21.0
70.5 5 5 45.5 1 1 20.5
70.0 6 5 45.0 20.0
69.5 3 1 44.5 19.5
69.0 6 5 44.0 19.0
68.5 1 5 43.5 18.5
68.0 8 4 43.0 2 18.0
67.5 3 2 42.5 17.5
67.0 2 18 42.0 1 17.0
66.5 3 4 41.5 16.5
66.0 4 3 41.0 16.0
65.5 1 4 40.5 15.5
65.0 3 2 40.0 1 15.0
64.5 3 7 39.5 1 14.5
64.0 6 6 39.0 14.0
63.5 3 5 38.5 13.5
63.0 6 3 38.0 13.0
62.5 2 2 37.5 12.5
62.0 4 7 37.0 12.0
61.5 3 4 36.5 11.5
61.0 3 1 36.0 11.0
60.5 5 3 35.5 10.5
60.0 8 2 35.0 10.0
59.5 2 1 34.5 9.5
59.0 3 2 34.0 9.0
58.5 3 5 33.5 8.5
58.0 1 1 33.0 1 1 8.0
57.5 1 5 32.5 7.5
57.0 2 1 32.0 7.0
56.5 1 2 31.5 6.5
56.0 1 2 31.0 6.0
55.5 2 30.5 5.5
55.0 3 30.0 5.0
54.5 2 2 29.5 4.5
54.0 3 1 29.0 4.0
53.5 3 28.5 3.5
53.0 3 2 28.0 3.0
52.5 1 2 27.5 2.5
52.0 1 3 27.0 2.0
51.5 1 26.5 1.5
51.0 2 26.0 1.0
50.5 2 2 25.5 .5
0.0 0 0
American Mathematics Competitions
2005 AMC 12 A Results for Idaho
SCORE DISTRIBUTION
score -----------grade-----------
6 7 8 9 10 11 12 13 unknown
---------------------------
125.5 1
119.5 2
118.5 1
115.0 2
113.5 1
111.5 1
111.0 1
109.0 1
108.5 1
108.0 1
106.5 1
105.5 1 1
104.5 4 1
104.0 2 2
103.0 1 1 1 1
102.0 2
101.5 1
101.0 2 2
100.5 2 1
99.5 2 1
98.5 2 2
97.5 1 1 1 2
97.0 2 2 1
96.0 2 5
95.0 1 5 6 2
94.5 1
94.0 2
93.5 2 6
92.5 3 2 3
91.5 1 2 5 3
91.0 1 2 1 3
90.5 5 2 1
90.0 2 1 1
89.0 1 2 8 2
88.5 1 5
88.0 2 5 4 2
87.5 2 3 3 2
87.0 2 2 1
86.5 2 3 3
85.5 10 4 2
85.0 1
84.5 1 9 4 1
84.0 2 3 1
83.5 4 5
83.0 1 7 10 2
82.5 2 3 1
82.0 6 2 4
81.5 5 1
81.0 5 2
80.5 1 1 2 2
80.0 5 1 2
79.5 3 7 4 2
79.0 2 3
78.5 1 8 3 1
78.0 5 1
77.5 5 4
77.0 1 9 3 1
76.5 5 1
76.0 1 7 7 2
75.5 3 3
75.0 2 13 4 2
74.5 4 3 1
74.0 1 9 3 1
73.5 1 5 9
73.0 1 4 3
72.5 7 4 1
72.0 1 3 2
71.5 6 5
71.0 5 1 1
70.5 7 3
70.0 2 5 5 1
69.5 1 1 3
69.0 2 3 6
68.5 5 1 2
68.0 1 9 3
67.5 4 2 1
67.0 1 10 8 1
66.5 1 1 3 2 2
66.0 6 2 1
65.5 5 1
65.0 4 2 1
64.5 1 6 3
64.0 4 9
63.5 4 3 1
63.0 1 2 3 3 1
62.5 2 2 1
62.0 6 5
61.5 2 4 2
61.0 1 3
60.5 5 2 1
60.0 7 3 1
59.5 1 2
59.0 1 4
58.5 6 2
58.0 1 1
57.5 5 1
57.0 2 1
56.5 2 1
56.0 3
55.5 2
55.0 1 2
54.5 1 3
54.0 4
53.5 3 1
53.0 2 2 1
52.5 3
52.0 1 3
51.5 1
51.0 1 1
50.5 3 1
49.5 1 2
47.5 1
46.5 1
45.5 1 1 1
43.0 1 1
42.0 1
40.0 1
39.5 1
33.0 2
American Mathematics Competitions
2005 AMC 12 A Results for Idaho
Analysis
Table of Item Difficulty for the 2005
American High School Mathematics Examination
Tabulation of responses for all Participants
Percent of Responses
ITEM A B C D E OMITS ?
____ _____ _____ _____ _____ _____ _____ _____
1 0.05 0.08 0.15 9.16* 0.14 0.41 0.00
2 0.00 9.41* 0.12 0.18 0.05 0.24 0.00
3 0.41 3.36* 1.12 0.46 0.48 4.16 0.00
4 6.17* 0.35 3.16 0.08 0.00 0.23 0.01
5 0.26 5.81* 2.26 0.15 0.05 1.47 0.00
6 0.40 4.76* 0.24 0.23 0.71 3.66 0.00
7 0.48 0.13 6.78* 0.04 0.08 2.50 0.00
8 0.27 0.34 0.26 1.49* 0.13 7.51 0.00
9 1.97* 0.49 0.59 0.30 0.05 6.60 0.00
10 0.49 2.11* 0.10 0.43 0.06 6.79 0.01
11 0.64 0.32 0.24 0.35 2.89* 5.55 0.00
12 1.02 0.18 0.23 2.60* 1.37 4.60 0.00
13 0.13 0.18 0.39 2.49* 0.23 6.59 0.00
14 0.30 0.37 2.78 0.67* 0.45 5.43 0.00
15 0.13 0.24 1.31* 0.72 0.67 6.92 0.00
16 0.15 0.17 0.85 0.43* 0.22 8.18 0.00
17 1.53* 0.64 1.26 0.22 0.34 6.01 0.00
18 0.22* 0.37 0.13 0.19 0.17 8.92 0.00
19 0.82 1.77* 0.95 0.43 0.79 5.24 0.00
20 0.24 0.09 0.14 0.08 0.12* 9.33 0.00
21 0.32 0.45 0.14* 0.21 0.06 8.81 0.00
22 0.30 0.34* 0.24 0.19 0.12 8.81 0.00
23 0.39 0.23* 0.08 0.19 0.35 8.76 0.00
24 0.14 0.10* 0.05 0.14 0.09 9.47 0.00
25 0.22 0.23 0.12* 0.14 0.09 9.20 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
2005 AMC 10 B Results for Idaho
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
150.0 125.0 100.0
149.5 124.5 99.5 1
149.0 124.0 99.0
148.5 123.5 98.5
148.0 123.0 98.0 1
147.5 122.5 97.5
147.0 122.0 97.0
146.5 121.5 96.5
146.0 121.0 96.0
145.5 120.5 95.5
145.0 120.0 95.0 2
144.5 119.5 94.5 1 2
144.0 119.0 94.0
143.5 118.5 93.5
143.0 118.0 93.0
142.5 117.5 92.5 1
142.0 117.0 92.0
141.5 116.5 91.5 1
141.0 116.0 91.0 2
140.5 115.5 1 90.5
140.0 115.0 90.0 1
139.5 114.5 89.5 1
139.0 114.0 89.0 1
138.5 113.5 88.5 1
138.0 113.0 88.0 1
137.5 112.5 87.5 1 1
137.0 112.0 87.0
136.5 111.5 86.5 1
136.0 111.0 1 86.0 1
135.5 110.5 85.5 2
135.0 110.0 85.0 2
134.5 109.5 84.5 2 1
134.0 109.0 84.0 1
133.5 108.5 83.5
133.0 108.0 83.0 2 1
132.5 107.5 1 82.5 1
132.0 107.0 82.0 3
131.5 106.5 1 1 81.5 1
131.0 106.0 81.0
130.5 105.5 80.5 2 1
130.0 105.0 80.0 1 1
129.5 104.5 79.5 1
129.0 104.0 79.0 1 1
128.5 103.5 78.5 1 2
128.0 103.0 78.0
127.5 102.5 77.5
127.0 102.0 77.0 1
126.5 101.5 76.5
126.0 101.0 1 76.0 3
125.5 100.5 75.5
American Mathematics Competitions
2005 AMC 10 B Results for Idaho
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
75.0 3 1 50.0 1 25.0
74.5 49.5 24.5
74.0 2 49.0 24.0
73.5 1 48.5 1 23.5
73.0 1 48.0 1 23.0
72.5 3 47.5 1 22.5
72.0 3 2 47.0 22.0
71.5 2 46.5 21.5
71.0 1 4 46.0 1 1 21.0
70.5 2 45.5 20.5
70.0 1 45.0 1 20.0
69.5 1 44.5 19.5
69.0 44.0 19.0
68.5 1 43.5 18.5
68.0 43.0 18.0
67.5 2 42.5 17.5
67.0 1 42.0 17.0
66.5 41.5 16.5
66.0 41.0 16.0
65.5 40.5 1 1 15.5
65.0 1 40.0 15.0
64.5 39.5 14.5
64.0 1 39.0 14.0
63.5 2 38.5 13.5
63.0 1 38.0 13.0
62.5 1 1 37.5 12.5
62.0 37.0 12.0
61.5 36.5 11.5
61.0 1 36.0 11.0
60.5 1 1 35.5 10.5
60.0 35.0 10.0
59.5 1 2 34.5 9.5
59.0 1 34.0 9.0
58.5 1 33.5 8.5
58.0 2 33.0 8.0
57.5 32.5 7.5
57.0 32.0 7.0
56.5 31.5 6.5
56.0 31.0 6.0
55.5 30.5 5.5
55.0 30.0 1 5.0
54.5 1 29.5 4.5
54.0 29.0 1 4.0
53.5 1 2 28.5 3.5
53.0 1 28.0 3.0
52.5 27.5 2.5
52.0 27.0 2.0
51.5 26.5 1.5
51.0 26.0 1.0
50.5 1 25.5 .5
0.0 0 0
American Mathematics Competitions
2005 AMC 10 B Results for Idaho
SCORE DISTRIBUTION
score -----------grade-----------
6 7 8 9 10 unknown
---------------------------
115.5 1
111.0 1
107.5 1
106.5 2
101.0 1
99.5 1
98.0 1 1
95.0 2
94.5 1 2
92.5 1
91.5 1
91.0 2
90.0 1 1
89.5 1
89.0 1
88.5 1
88.0 1
87.5 1 1
86.5 1
86.0 1
85.5 2
85.0 1 1
84.5 1 2
84.0 1
83.0 3
82.5 1
82.0 3
81.5 1
80.5 1 2
80.0 2
79.5 1
79.0 1 1
78.5 1 2
77.0 1
76.0 1 2
75.0 1 1 2
74.0 1 1
73.5 1
73.0 1
72.5 3
72.0 3 2
71.5 1 1
71.0 5
70.5 1 1
70.0 1
69.5 1
68.5 1
67.5 1 1
67.0 1
65.0 1
64.0 1
63.5 1 2
63.0 1
62.5 1 1
61.0 1
60.5 1 1
59.5 1 1 1
59.0 1
58.5 1
58.0 1 1
54.5 1
53.5 1 1 1
53.0 1
50.5 1
50.0 1
48.5 1
48.0 1
47.5 1
46.0 1 1
45.0 1
43.5 1
40.5 1 1
30.0 1
29.0 1
American Mathematics Competitions
2005 AMC 10 B Results for Idaho
Analysis
Table of Item Difficulty for the 2005
American High School Mathematics Examination
Tabulation of responses for all Participants
Percent of Responses
ITEM A B C D E OMITS ?
____ _____ _____ _____ _____ _____ _____ _____
1 7.86* 0.24 0.71 0.48 0.56 0.16 0.00
2 0.08 0.63 0.16 7.14* 0.63 1.35 0.00
3 0.00 0.48 3.25 5.08* 0.71 0.48 0.00
4 1.03 0.08 0.79 2.22* 0.48 5.40 0.00
5 0.00 0.00 8.81* 0.08 0.40 0.71 0.00
6 0.16 7.62* 0.16 0.63 0.24 1.19 0.00
7 0.48 0.87* 0.40 0.79 0.79 6.67 0.00
8 4.68* 0.16 1.11 0.00 0.08 3.97 0.00
9 0.16 0.32 2.78 4.05* 0.40 2.30 0.00
10 1.51* 0.71 0.24 0.32 0.16 7.06 0.00
11 0.32 0.24 0.24 1.75 1.51* 5.95 0.00
12 0.48 1.11 0.16 0.32 0.08* 7.86 0.00
13 0.32 0.63 1.19* 1.11 0.48 6.27 0.00
14 0.40 0.24 1.03* 2.54 0.63 5.16 0.00
15 0.87 0.32 0.48 4.13* 0.63 3.57 0.00
16 0.32 0.79 0.56 0.16* 0.16 8.02 0.00
17 0.48 2.06* 0.95 0.32 0.00 6.19 0.00
18 0.32 4.68 0.95 1.59* 0.48 1.98 0.00
19 0.56 5.24* 0.40 0.24 0.48 3.10 0.00
20 0.40 0.24 1.27* 0.63 0.16 7.30 0.00
21 0.32* 0.48 0.08 0.00 0.16 8.97 0.00
22 0.48 0.48 0.40* 0.16 0.24 8.25 0.00
23 2.46 0.56 0.24* 0.32 0.08 6.35 0.00
24 0.24 0.08 0.08 0.56 0.87* 8.17 0.00
25 0.56 0.24 2.54* 0.24 0.32 6.11 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
2005 AMC 12 B Results for Idaho
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
150.0 125.0 100.0
149.5 124.5 99.5 1
149.0 124.0 99.0
148.5 123.5 98.5 1
148.0 123.0 98.0
147.5 122.5 97.5
147.0 122.0 97.0
146.5 121.5 96.5
146.0 121.0 96.0 2 1
145.5 120.5 95.5
145.0 120.0 95.0 1
144.5 119.5 94.5 1
144.0 119.0 94.0 1
143.5 118.5 93.5
143.0 118.0 93.0
142.5 117.5 92.5 1
142.0 117.0 92.0
141.5 116.5 91.5 1
141.0 116.0 91.0 1 1
140.5 115.5 90.5 1
140.0 115.0 90.0 1
139.5 114.5 89.5
139.0 114.0 89.0 2 2
138.5 113.5 88.5
138.0 113.0 88.0 3
137.5 112.5 87.5 2
137.0 112.0 87.0 2
136.5 111.5 86.5 4
136.0 111.0 86.0
135.5 110.5 85.5 2
135.0 110.0 85.0 1
134.5 109.5 84.5 2
134.0 109.0 84.0 3 1
133.5 108.5 83.5 1
133.0 108.0 83.0 2 1
132.5 107.5 82.5
132.0 107.0 82.0 3 3
131.5 106.5 81.5 1
131.0 106.0 81.0 4
130.5 105.5 80.5 2
130.0 105.0 80.0 1 1
129.5 104.5 79.5 2
129.0 104.0 79.0
128.5 103.5 78.5 1
128.0 103.0 78.0 3
127.5 102.5 77.5 1 2
127.0 102.0 77.0 4 1
126.5 101.5 76.5 2
126.0 101.0 1 76.0 3 1
125.5 100.5 75.5 2
American Mathematics Competitions
2005 AMC 12 B Results for Idaho
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
75.0 1 4 50.0 25.0
74.5 1 49.5 24.5
74.0 2 2 49.0 24.0
73.5 2 48.5 23.5
73.0 48.0 1 23.0
72.5 2 47.5 22.5
72.0 47.0 22.0
71.5 1 46.5 21.5
71.0 2 46.0 21.0
70.5 1 45.5 20.5
70.0 45.0 20.0
69.5 3 1 44.5 19.5
69.0 44.0 19.0
68.5 1 43.5 18.5
68.0 1 43.0 18.0
67.5 1 42.5 17.5
67.0 1 42.0 1 17.0
66.5 2 2 41.5 16.5
66.0 1 41.0 16.0
65.5 1 40.5 15.5
65.0 1 40.0 15.0
64.5 39.5 14.5
64.0 39.0 1 14.0
63.5 1 38.5 13.5
63.0 1 1 38.0 13.0
62.5 37.5 12.5
62.0 1 37.0 12.0
61.5 36.5 11.5
61.0 1 1 36.0 11.0
60.5 1 35.5 10.5
60.0 1 1 35.0 10.0
59.5 1 34.5 9.5
59.0 34.0 9.0
58.5 33.5 8.5
58.0 1 33.0 8.0
57.5 32.5 7.5
57.0 32.0 7.0
56.5 1 31.5 6.5
56.0 31.0 6.0
55.5 1 30.5 5.5
55.0 30.0 5.0
54.5 2 29.5 4.5
54.0 1 29.0 4.0
53.5 28.5 3.5
53.0 28.0 3.0
52.5 27.5 2.5
52.0 27.0 2.0
51.5 26.5 1.5
51.0 1 26.0 1.0
50.5 25.5 .5
0.0 0 0
American Mathematics Competitions
2005 AMC 12 B Results for Idaho
SCORE DISTRIBUTION
score -----------grade-----------
6 7 8 9 10 11 12 13 unknown
---------------------------
101.0 1
99.5 1
98.5 1
96.0 2 1
95.0 1
94.5 1
94.0 1
92.5 1
91.5 1
91.0 1 1
90.5 1
90.0 1
89.0 5
88.0 3
87.5 1 1
87.0 1 1
86.5 2 2
85.5 2
85.0 1
84.5 2
84.0 1 3
83.5 1
83.0 2 1
82.0 4 2
81.5 1
81.0 2 2
80.5 2
80.0 1 1
79.5 1 1
78.5 1
78.0 3
77.5 2 1
77.0 3 2
76.5 2
76.0 1 3
75.5 2
75.0 3 2
74.5 1
74.0 3 2
73.5 1 1
73.0 1
72.5 2
71.5 1
71.0 2
70.5 1
69.5 5
68.5 1
68.0 1
67.5 1
67.0 1
66.5 4
66.0 1
65.5 1
65.0 1
63.5 1
63.0 2
62.0 1
61.0 2
60.5 1
60.0 2
59.5 1
58.0 1
56.5 1
55.5 1
54.5 2
54.0 1
51.0 1
48.0 1
42.0 1
39.0 1
American Mathematics Competitions
2005 AMC 12 B Results for Idaho
Analysis
Table of Item Difficulty for the 2005
American High School Mathematics Examination
Tabulation of responses for all Participants
Percent of Responses
ITEM A B C D E OMITS ?
____ _____ _____ _____ _____ _____ _____ _____
1 8.39* 0.00 0.66 0.29 0.58 0.07 0.00
2 0.22 0.00 0.00 8.98* 0.07 0.73 0.00
3 0.07 0.15 8.47* 0.07 0.58 0.66 0.00
4 0.15 8.39* 0.22 0.22 0.22 0.80 0.00
5 6.06* 0.00 0.80 0.00 0.22 2.92 0.00
6 1.39* 1.02 0.44 0.15 0.51 6.50 0.00
7 0.44 1.24 0.07 1.17* 0.44 6.64 0.00
8 1.17 1.90 2.55* 0.00 0.51 3.87 0.00
9 0.15 5.99* 0.22 0.36 0.51 2.77 0.00
10 0.07 0.58 0.07 1.90 2.70* 4.67 0.00
11 1.17 1.02 0.66 3.43* 0.66 3.07 0.00
12 0.36 0.58 0.58 0.22* 0.07 8.18 0.00
13 0.44 0.15 0.29 0.44* 0.29 8.39 0.00
14 0.36 1.02 0.51 0.44 0.58* 7.08 0.00
15 0.66 0.22 0.36 3.58* 0.36 4.82 0.00
16 0.36 0.29 0.58 0.22* 0.15 8.39 0.00
17 0.07 0.22* 0.00 0.15 0.58 8.98 0.00
18 1.39 0.51 0.15* 0.07 0.22 7.66 0.00
19 0.51 0.22 0.00 0.22 1.17* 7.88 0.00
20 0.22 0.15 3.50* 0.44 2.19 3.50 0.00
21 0.22 0.22 0.44* 0.00 0.07 9.05 0.00
22 0.51 0.95 0.22 0.15 0.22* 7.96 0.00
23 0.15 0.29* 0.00 0.15 0.00 9.42 0.00
24 0.15* 0.36 0.07 0.07 0.36 8.98 0.00
25 0.00* 0.29 0.15 0.15 0.51 8.91 0.00
(*) Correct Response
(?) Response the computer was unable to read due to incomplete
erasures or two answers marked in the same column