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Mean

The mean of a set of numbers, x1, x2,.xn is defined to be (x1 + x2...+ xn) ÷ 4n. Thus the mean of 2, 3, 7, and 5 is (2 + 3 + 7 + 5) ÷ 4 = 17 ÷ 4.

The mean is also known as the average. It is one of the measures of central tendency, the others being the mode and median.

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