[issue27181] Add geometric mean to `statistics` module

[Steven D'Aprano]

Steven D'Aprano added the comment:

I thought about special-casing n=2 to math.sqrt, but as that's an 
implementation detail I can make that change at any time. According 
to my testing, math.pow(x, 0.5) is no worse than sqrt, so I'm not 
sure if there's any advantage to having yet another branch.

I'd be interested in special-casing n=3 to math.cbrt (if and when it exists) 
now that its a standard C99 function.

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<http://bugs.python.org/issue27181>
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