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arithmetic mean
ar·ith·met·ic mean (plural ar·ith·met·ic means)


noun 
Definition:
 
average of several numbers: the average of a set of numbers, calculated by adding them together and then dividing their sum by the number of terms
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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