Definition:Harmonic Mean

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This page is about Harmonic Mean in the context of Algebra. For other uses, see Mean.


Let $x_1, x_2, \ldots, x_n \in \R$ be real numbers which are all strictly positive.

The harmonic mean $H_n$ of $x_1, x_2, \ldots, x_n$ is defined as:

$\ds \dfrac 1 {H_n} := \frac 1 n \paren {\sum_{k \mathop = 1}^n \frac 1 {x_k} }$

That is, to find the harmonic mean of a set of $n$ numbers, take the reciprocal of the arithmetic mean of their reciprocals.

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