Answers to Normal Distribution Problems

1.  a.  .2734

    b.  .1443

    c.  .6430

    d.  .3157

2.  125.04

3.  25

4.  a.  1.60  (.0548)  (500) = 27

   b.  1.20  (.1151)  (500) = 58

   c.  79

   d.  C-30 = 67

   e. Centile rank of 75 = 62

   f. Centile rank of 65 = 24


5.  18.65%

6.  91

7.  27

8.  34.79%

9.  A   1.28 - up     66.4 - up

    B    .52 - 1.27   62.6 - 66.3

    C   -.52 -   51   57.4 - 62.5

    D  -1.28 - -.53   53.5 - 57.3

    F  -1.29 - Down   53.5 - Down