About 95.4% of the values of a normal random variable are within approximately how many standard deviations of its mean?
A) ±1.7
B) ±2
C) ±2.5
D) ±3

Name: About 95.4% of the values of a normal random variable are within approximately how many standard deviations of its mean? A) ±1.7 B) ±2 C) ±2.5 D) ±3
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Quizplus · Accepted Answer

This is known as the rule of 2 sigma, which states that approximately 95.4% of the values of a normal random variable are within ±2 standard deviations of its mean.

About 954% of the Values of a Normal Random Variable Are