Roughly ______ of z-scores in the standard normal distribution are within ±3 standard deviations of the mean.
A) one-third
B) half
C) two-thirds
D) all

Name: Roughly ______ of z-scores in the standard normal distribution are within ±3 standard deviations of the mean. A) one-third B) half C) two-thirds D) all
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Quizplus · Accepted Answer

In a standard normal distribution, approximately 99.7% of z-scores fall within ±3 standard deviations of the mean, which is nearly all of them.

Roughly ______ of Z-Scores in the Standard Normal Distribution Are