For a normal distribution, the amount of the distribution that lies within plus or minus two standard deviations of the mean is approximately:
A) 68 percent.
B) 95 percent.
C) 98 percent.
D) 99 percent.
E) 64 percent.

Question

Quizplus · Accepted Answer

This is known as the 68-95-99.7 rule, which states that approximately 68% of the distribution lies within one standard deviation of the mean, approximately 95% lies within two standard deviations of the mean, and approximately 99.7% lies within three standard deviations of the mean. Therefore, the answer is option B, 95 percent.

For a Normal Distribution, the Amount of the Distribution That