Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

> what it's correcting for is an inaccurate value of "c" [...]

I'll leave the logic as-is and just add a note about what is being corrected.

> Numerically, it's probably not helpful.

To make a difference, the mean would have to have huge magnitude relative to 
the variance; otherwise, squaring the error would drown it out to zero.

The mean() should already be accurate to within a 1/2 ulp.  The summation and 
division are exact.  There is only a single rounding when the result converts 
from Fraction to a float or decimal.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39218>
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