In her MAT135 class, professor Alayeb found that the mean score of the first exam was 96.

Question

what is the probability that a randomly selected score is between 71 and 82 ? ( 71 < x < 82)

 = 

Answer 1

In order to answer this question, you need the standard deviation in addition to the mean. This allows you to turn the 71 and 82 into Z-scores which can then be used to find the probability. Without the standard deviation, the problem cannot be solved.