Dictionary:Standard deviation

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The standard deviation σ of measurements of a quantity with respect to the mean is

With a normal or Gaussian distribution of data, 68.3% of the data fall within a standard deviation about the mean. The square of the standard deviation is the variance. See statistical measures.

For two degrees of freedom, measurements with respect to the means , is

For a Rayleigh distribution of data, 40.5% fall within a circle of radius (called one sigma).

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Standard deviation
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