**Harmonic Mean**

A kind of average. To find the harmonic mean of a set of *n* numbers, add the reciprocals of the numbers in the set, divide the sum by *n*, then take the reciprocal of the result. The harmonic mean of {*a*_{1}, *a*_{2}, *a*_{3}, *a*_{4}, . . ., *a*_{n}} is given below.

**See also**

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