In a normal distribution, what percent of test takers will score between 1 standard deviation below and 1 standard deviation above the mean?
A) 2.1%
B) 13.6%
C) 34.1%
D) 68.2%

Question

Quizplus · Accepted Answer

This is a common rule known as the 68-95-99.7 rule, which states that in a normal distribution, approximately 68.2% of the data (test takers in this case) will fall within one standard deviation of the mean.

In a Normal Distribution, What Percent of Test Takers Will