[issue36546] Add quantiles() to the statistics module

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

One other thought:  The PR implements both methods 6 and 7 which means that that we can reproduce the results of every major stats tool except for Mathematica.  The summary of properties chart of  in Hyndman & Fan lists our default as satisfying 5 of 6 desirable properties.  This is the same as for method 8 which almost no one uses by default.

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