[issue36018] Add a Normal Distribution class to the statistics module

[Raymond Hettinger]

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


----------
pull_requests: +15389
pull_request: https://github.com/python/cpython/pull/15734

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36018>
_______________________________________