Variance
 Usage
• Variance[list] gives the statistical variance of the elements in list.
Notes
• Variance[list] gives the unbiased estimate of variance. • Variance[list] is equivalent to Total[(list-Mean[list])^2]/(Length[list]-1). • Variance handles both numerical and symbolic data. • Variance[{{ ,  , ... }, { ,  , ... }, ... }] gives {Variance[{ ,  , ... }], Variance[{ ,  , ... }]}. • New in Version 5.
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