Variance

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Variance 2</sup>)</strong> </dt>
In statistics, a measure of variability (or spread); the mean-square deviation from the mean, that is , the mean of the squares of the differences between individual values of x and the mean value μ.

σ = E[(x - μ)2] = E(x2) - μ2

where E denotes expected value. The positive square root σ of the variance is called the standard deviation. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use