Which of the following is true of all normal distributions?

A) They are symmetrical.
B) They have a standard deviation of zero.
C) They have a mean equal to the standard deviation.
D) They have a mean of zero.

Normal Distributions

A bell-shaped frequency distribution curve, where most of the data points are concentrated around the mean or average, often seen in natural phenomena and human attributes.

Symmetrical

Symmetrical refers to a situation where two halves of a whole are identical, mirror images of each other, maintaining balance and proportion.

Standard Deviation

A measure of the amount of variation or dispersion of a set of values, indicating how much the individual values in a dataset deviate from the mean of the dataset.