Which of the following is not a characteristic of the normal probability distribution?

A) The mean, median, and the mode are equal
B) The mean of the distribution can be negative, zero, or positive
C) The distribution is symmetrical
D) The standard deviation must be 1

Normal Probability Distribution

A bell-shaped distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean.

Standard Deviation

A framework for measuring the extent of divergence or distribution in a collection of quantities.