Harmonic Mean (HM) of n Numbers

Rarely Tested
Harmonic mean of $$n$$ non-zero numbers $$a_1, a_2, \ldots, a_n$$:
$$ HM = \frac{n}{\frac{1}{a_1} + \frac{1}{a_2} + \cdots + \frac{1}{a_n}} $$
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