Definition:Quadratic Mean

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This page is about Quadratic Mean. For other uses, see 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