The mean of the numbers a1, a2, ..., an is equal to (a1 + a2 + ..., + an)/n.
This number is used mostly as the average. It is called the arithmetic mean.
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arithmetic mean
The arithmetic mean is an average arrived at by adding all the terms together and then dividing by the number of terms.
An arithmetic mean is a measure of central tendency of a set of values computed by dividing the sum of the values by the number of values.
The arithmetic mean is a weighted mean where each observation is given the same weight.
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