Approximately _____ percent of scores fall within 3 standard deviations of the mean.
A) 100
B) 96
C) 50
D) 34

Question

Quizplus · Accepted Answer

Approximately 100 percent of scores fall within 3 standard deviations of the mean according to the empirical rule, also known as the 68-95-99.7 rule, which states that for a normal distribution, about 68% of the data falls within one standard deviation of the mean, about 95% falls within two standard deviations, and about 99.7% falls within three standard deviations. This means virtually all (or 100% for practical purposes) of the data falls within three standard deviations of the mean.

Approximately _____ Percent of Scores Fall Within 3 Standard Deviations