[issue27181] Add geometric mean to `statistics` module

[koobs]

koobs added the comment:

For posterity, the following failure was observed on all (9/10/11(current) FreeBSD buildbots:

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FAIL: testFraction (test.test_statistics.Test_Nth_Root)
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Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/test_statistics.py", line 1247, in testFraction
    self.assertEqual(self.nroot(x**12, 12), float(x))
AssertionError: 1.1866666666666665 != 1.1866666666666668

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nosy: +koobs

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