[issue18606] Add statistics module to standard library

[Larry Hastings]

Larry Hastings added the comment:

Mr. D'Aprano emailed me about getting this in for alpha 4.  Since nobody else stepped up, I volunteered to check it in for him.  There were some minor ReST errors in statistics.rst but I fixed 'em.

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nosy: +larry

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18606>
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