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

[Michael Selik]

Michael Selik <mike at selik.org> added the comment:

+1, This would be useful for quick analyses, avoiding the overhead of installing scipy and looking through its documentation.

Given that it's in the statistics namespace, I think the name can be simply ``Normal`` rather than ``NormalDist``.  Also, instead of ``.from_examples`` consider naming the classmethod ``.fit``.

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nosy: +selik

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<https://bugs.python.org/issue36018>
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