[issue20389] clarify meaning of xbar and mu in pvariance/variance of statistics module

[Nick Coghlan]

Nick Coghlan added the comment:

Steven included some draft docs updates in a separate patch for issue 20481 - I have split those out and uploaded them here (since this discussion refers to the docstrings as well).

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keywords: +patch
nosy: +ncoghlan
Added file: http://bugs.python.org/file33990/issue20389_statistics_docs.diff

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