According to the Empirical Rule,the percentage of observations in a data set (providing that the data set has a bell-shaped and symmetric distribution)that should fall within two standard deviations of their mean is approximately:
A)90%
B)95%
C)97.5%
D)100%

Question

Quizplus · Accepted Answer

The Empirical Rule states that approximately 95% of the observations in a data set with a bell-shaped and symmetric distribution fall within two standard deviations of their mean. Therefore, B is the best choice.

According to the Empirical Rule,the Percentage of Observations in a Data