SigmaXX Command

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SigmaXX[List of Numbers]
Calculates the sum of squares of the given numbers.
Example: In order to work out the variance of a list you may use SigmaXX[list] / Length[list] - Mean[list]^2.
SigmaXX[List of Points]
Calculates the sum of squares of the x-coordinates of the given points.
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