Question

Many colleges use exit examinations to determine if students can move from remedial math to college level math course. Suppose that in one semester on a college’s exit exam there is a mean score of 25 and a standard deviation of 6.

What percentage of the scores fall between 10 and 40?
A) 90%
B) 98.76%
C) 99.7%
D) 95%

Answer 1

Are you sure the numbers are right? The range is 15 below the mean to 15 above the mean. The 68-95-99 rule would indicate the 95% of the scores would be between 13 and 37.

Answer 2

15.
What percentage of the scores are above 20?
A) 20.33%
B) 25%
C) 79.67%
D) 75%
16.
What percent of the scores are below 7?
A) 0.25%
B) 1%
C) 2.5%
D) 0.13%
17.
What percent of the scores fall between 22 and 35?
A) 64.4%
B) 50%
C) 68%
D) 75.2%