With symmetric, "bell-shaped" distributions, approximately what percent of the observations are within two standard deviations of the mean?
A) 50%
B) 68%
C) 95%
D) 99.7%
E) 100%

Question

Quizplus · Accepted Answer

In a symmetric, bell-shaped distribution, approximately 95% of the observations fall within two standard deviations of the mean, according to the empirical rule (68-95-99.7 rule).

With Symmetric, "Bell-Shaped" Distributions, Approximately What Percent of the Observations