The empirical rule states that the percentage of observations in a data set (provided that the data set has a bell-shaped and symmetric distribution) that fall within one standard deviation of their mean is
approximately 75%.

Question

Quizplus · Accepted Answer

The empirical rule actually states that approximately 68% of observations fall within one standard deviation of the mean in a bell-shaped and symmetric distribution.

The Empirical Rule States That the Percentage of Observations in a Data