Assume that a set of test scores in an Introduction to Finance class is normally distributed with a mean of 72 and a standard deviation of 8.Use the 68-95-99.7 rule to find the percentage of scores between 80 and 96.
A)13.5%
B)15.85%
C)30.7%
D)2.5%
E)25.5%

Question

Quizplus · Accepted Answer

According to the 68-95-99.7 rule, 68% of scores lie within one standard deviation (64 to 80), 95% within two (56 to 88), and 99.7% within three (48 to 96). Scores between 80 and 96 cover the range from one to three standard deviations above the mean, which is 13.5% (from 80 to 88) plus 2.35% (from 88 to 96), totaling 15.85%.

Assume That a Set of Test Scores in an Introduction