Definition:Quadratic Mean

Definition
Let $x_1, x_2, \ldots, x_n \in \R$ be real numbers.

The quadratic mean of $x_1, x_2, \ldots, x_n$ is defined as:


 * $Q_n := \displaystyle \sqrt {\frac 1 n \sum_{k \mathop = 1}^n x_k^2}$

Also see

 * Definition:Mean