# Arithmetic mean

From Encyclopedia of Mathematics

The number $a$ obtained by dividing the sum of several numbers $a_1,\ldots,a_n$ by their number $n$:

$$a=\frac{a_1+\ldots+a_n}{n}.$$

**How to Cite This Entry:**

Arithmetic mean.

*Encyclopedia of Mathematics.*URL: http://www.encyclopediaofmath.org/index.php?title=Arithmetic_mean&oldid=31433