# Arithmetic mean

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

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

How to Cite This Entry:
Arithmetic mean. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Arithmetic_mean&oldid=44585