Average mean refactor (#4485)

* Average mean refactor

Added doctests and type hints to average_mean

* Wiki link added

* Empty list check added

Empty list check added
Type hint changed to typing.List

Grigoriy Hanin committed 4y ago

7d19d54f6f247bb16b4299d2a20548d6a279d635

Parent: 0eabdb5

Committed by GitHub <noreply@github.com> on 6/16/2021, 6:33:23 AM