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Sigma (x-ar{x})^2=Sigma x^2- rac{ (Sigma x)^2 }{n}                "Sum of Squares" for Variance Standard Deviation. (Hint: ar{x}= rac{ Sigma x }{n} and Sigma x=nar{x}

Please show the work of how these two equations are equal....

とX3 +3x3とーと 3 とい ㄋ と]

This is as far as I can get it to work....

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