Question

1) The distribution of 800 test scores in an introduction to criminal justice course had a mean of 35 and a standard deviation of 6.

1. What proportion of the students had scores between 30 and 40?
2. Would you expect to find the same proportion of students between scores of 20 and 30? If so, why? If not, why?

2) Find the proportion of the area under the normal distribution that lies

1. below Z = .50
2. above Z = .50
3. below Z = -1.50
4. above Z = 1.50
5. below Z = 2.25
6. below Z = 1.64
7. between Z = .25 and Z = .75
8. Between Z = 0 and Z = 1.75
9. Between Z = -1.96 and Z = 1.96

Answer 1