RootMeanSquare

RootMeanSquare[list] gives the root mean square of values in list.

RootMeanSquare[dist] gives the root mean square of the distribution dist.

Examples

RootMeanSquare[{1, 2, 3, 4, 5}]
(* Sqrt[11] *)

RootMeanSquare[{-2, 2, -2, 2}]
(* 2 *)

Please visit the official Wolfram Language Reference for more details.