Category:Definitions/Standard Deviation
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This category contains definitions related to Standard Deviation.
Related results can be found in Category:Standard Deviation.
Let $X$ be a random variable.
Then the standard deviation of $X$, written $\sigma_X$ or $\sigma$, is defined as the principal square root of the variance of $X$:
- $\sigma_X := \sqrt {\var X}$
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