u/Dry-Stuff154

Var(X) = E(X^2)-(E(X))^2

And not simply :

Var(X) = E(X^2)-E(X)^2

I'm writting an oral essay for school, while I like the stylistic choice of "society machinery", I'm not sure it sounds okay in English.

For you does it sounds completely natural, like a interesting stylistic choice or simply weird ?

I know how to demonstrate it if i really need but it takes time.

If anyone has a quick and easy way to get the formulas right every time i would greatly appreciate it !