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Arithmetic mean

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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