In a normal distribution, _________________ percent of the cases fall within -1 and 1 standard deviations of the mean.
A) 100
B) 99
C) 34.13
D) 95

Question

Quizplus · Accepted Answer

In a normal distribution, approximately 68% of the cases fall within -1 and 1 standard deviations of the mean. This is known as the 68-95-99.7 rule, where approximately 95% of the cases fall within -2 and 2 standard deviations of the mean. Therefore, the best choice is D, which states that 95% of the cases fall within -1 and 1 standard deviations of the mean.

In a Normal Distribution, _________________ Percent of the Cases Fall