On all normal curves the area between the mean and ± 1 standard deviation will be
A) about 34% of the total area
B) about 68% of the total area
C) 50% of the total area
D) 99.9% of the total area

Question

Quizplus · Accepted Answer

This is known as the empirical rule or 68-95-99.7 rule, which states that approximately 68% of the data falls within one standard deviation of the mean, 95% falls within two standard deviations, and 99.7% falls within three standard deviations. Therefore, choice B is the best answer as it refers to the area between the mean and ± 1 standard deviation.

On All Normal Curves the Area Between the Mean and ±