Ali Mousa 8fd22b61be
Add variance and stddev subcommands to math command (#2154)
* add variance (population)
subcommand to math

* impl variance subcommand with spanning errors for invalid types

* add stddev subcommand to math

* rename bytes to filesize

* clippy fix -- use expect instead of unwrap in variance tests
2020-07-15 07:15:02 +12:00
..
2020-07-11 14:17:37 +12:00
2020-07-11 14:17:37 +12:00