[issue27181] Add geometric mean to `statistics` module

[Ned Deily]

Ned Deily added the comment:

FTR, multiple platforms are failing in various ways, not just PPC64, so Issue27761 was expanded to cover them and has been marked as a "release blocker".

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nosy: +ned.deily

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27181>
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