[issue28240] Enhance the timeit module: display average +- std dev instead of minimum

[STINNER Victor]

STINNER Victor added the comment:

The perf module displays the median rather than the mean (arithmeric average). The difference between median and mean is probably too subtle for most users :-/ The term "median" is also probably unknown by most users...

I chose to use average: well known, easy to understand (we learn the formula at school: sum/count).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28240>
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