[issue20479] Efficiently support weight/frequency mappings in the statistics module

[Steven D'Aprano]

Steven D'Aprano added the comment:

Off the top of my head, I can think of three APIs:

(1) separate functions, as Nick suggests:
mean vs weighted_mean, stdev vs weighted_stdev

(2) treat mappings as an implied (value, frequency) pairs

(3) take an additional argument to switch between unweighted and weighted modes.

I dislike #3, but will consider the others for 3.5.

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assignee:  -> stevenjd

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