# SigmaXX Command

From GeoGebra Manual

- 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`

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- SigmaXX[List of Points]
- Calculates the sum of squares of the
*x*-coordinates of the given points.