On all normal curves the area between the mean and ± 2 standard deviations will be________.
A) about 34% of the total area.
B) about 95% of the total area.
C) less than 50% of the total area.
D) about 68% of the total area.

Question

Quizplus · Accepted Answer

This is known as the 95% rule, where it is estimated that 95% of the data falls within 2 standard deviations of the mean. This leaves only 5% of the data outside of this range, split into approximately 2.5% above and 2.5% below.

On All Normal Curves the Area Between the Mean and ±