Mean (4 of 4) Harmonic Mean

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Harmonic Mean
The harmonic mean is used to take the mean of sample sizes. If there are k samples each of size n, then the harmonic mean is defined as:



For the numbers 1, 2, 3, and 10, the harmonic mean is:



= 2.069. This is less than the geometric mean of 2.78 and the arithmetic mean of 4.

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