The range of values found by adding and subtracting three standard deviations to the mean of the random variable accounts for 99.74 percent of the area under the curve.

Question

Quizplus · Accepted Answer

This statement is true. The range of values from the mean to three standard deviations above and below the mean in a normal distribution encompasses 99.74% of the area under the curve. This is also known as the 68-95-99.7 rule.

The Range of Values Found by Adding and Subtracting Three