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Normal Properties

GRE-4J9FB1

Which of the following does NOT necessarily describe a data set which is approximately normally distributed?

A

The mean, median, and mode are roughly the same.

B

About two-thirds of the data are within one standard deviation of the mean.

C

Almost all of the data are within two standard deviations of the mean.

D

The data is generally grouped symmetrically around the mean.

E

There are a small number of elements in the data set.