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