[issue36546] Add quantiles() to the statistics module

[Raymond Hettinger]

Change by Raymond Hettinger <raymond.hettinger at gmail.com>:


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pull_requests: +13653
pull_request: https://github.com/python/cpython/pull/13769

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36546>
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