[issue27181] Add geometric mean to `statistics` module

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> On the basis that something is better than nothing, go ahead.
> We can discuss accuracy and speed issues later.

Thanks.  I'll put together a PR for your consideration.

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