stats_harmonic_mean
(PECL stats >= 1.0.0)
stats_harmonic_mean — Returns the harmonic mean of an array of values
Description
stats_harmonic_mean ( array $a ) : number
Returns the harmonic mean of the values in a.
Parameters
-
a -
The input array
Return Values
Returns the harmonic mean of the values in a, or false if a is empty or is not an array.
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https://www.php.net/manual/en/function.stats-harmonic-mean.php