Standard deviation does not work as expected

Moved from GitHub dgraph/5339

Posted by sleto-it:

What version of Dgraph are you using?

20.03.1

Have you tried reproducing the issue with the latest release?

What is the hardware spec (RAM, OS)?

Steps to reproduce the issue (command/config used to run Dgraph).

See Standard Deviation and comment from Pawan

Expected behaviour and actual result.