[issue27181] Add geometric mean to `statistics` module

[Roundup Robot]

Roundup Robot added the comment:

New changeset 54288b160243 by Victor Stinner in branch 'default':
Issue #27181: Skip tests known to fail until a fix is found
https://hg.python.org/cpython/rev/54288b160243

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