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.
SigmaXX[ <List of Numbers>, <List of Frequencies> ]
Calculates the weighted sum of squares of the given numbers.
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