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Add arithmetic_mean.py (#4243)

* arithmetic_mean

* arithmetic_mean

* checks

* checked

* Revert "checked"

This reverts commit 3913a39ae2c4ee183443eed67ee7427e3d322ad4.

* checks-3

* update-1
A
Ayush Bisht committed
ced83bed2cda5a1a4353f3ced2871a884d380879
Parent: ecf9b81
Committed by GitHub <noreply@github.com> on 3/12/2021, 7:25:54 AM