Arithmetic_Mean
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The Arithmetic Mean is defined as the sum of all the members of a set of data divided by the number of items in the set. If the set used is a Population, then we speak of the Population Mean. When the set is a Sample, we call the Statistic a Sample Mean.
x[1] + x[2] + ... + x[n]
mean = ------------------------ where [] encloses an index
n
see also Weighted Mean, Variance, Central Tendancy