do all the fomulae of arithmatic mean.
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Arithmetic Mean Formula. Sum of all of the numbers of a group, when divided by the number of items in that list is known as the Arithmetic Mean or Mean of the group. For example, the mean of the numbers 5, 7, 9 is 4 since 5+7+9 = 21 and 21 divided by 3 [there are three numbers] is 7.
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