# Glossary (Version 8.4)

The arithmetic mean of a list of numbers is the sum of the data values divided by the number of numbers in the list.

In everyday language, the arithmetic mean is commonly called the average; for example, for the following list of five numbers, {2, 3, 3, 6, 8}, the mean equals $$\frac{2+3+3+6+8}5=\frac{22}5=4.4$$