Much too easy for 5kyu!

I'm sorry, what I meant was "power of 2" not "squareroot"... Anyway, the main reason for my troubles are more likely the combined lack of comrehension, notation, math and english skills :-(

it is hard to see that the second 2 is the squareroot and not mean

There is no square root involved; I think you are perhaps misreading?

If others have similar confusions I suggest you find the definition of population variance on Google.

I find the pseudo code very confusing. When describing: (1 - 2)^2 while mean is 2, it is hard to see that the second 2 is the squareroot and not mean. Secondly, at least for JS, ^ is a binary oparator. Therefoe it is confusing that it is meant to be square.

There's perhaps a typo in the description, it's average instead of mean, I think it's more correct, really easy kata though, is there also any planned for standard deviation?

Haskell

What language?

Tests do not match type signature

JS ( now ) has random tests, CoffeeScript does not, Haskell does, Python does, COBOL presumably does ( but I can't actually read it ).

Only CS to update.

JS has this problem, Haskell does not, Python does not, COBOl does not, CoffeeScript does.

JS and CS to update.

Approved

COBOL translation (author inactive).

Test.expect should be replaced with Test.assertEquals

Can't be changed.

too easy for a 5kyu.