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Given the mean ( ) = n 1 k = 1 n x k Show that: n 1 k = 1 n ( x k

Given the mean () = n1k=1nxk Show that:

n1k=1n(xk)2=n1k=1nxk22

I realize that 2 is independent of the sum on the RHS, but I'm having trouble with squaring sums. What do I do with k=1nk!=in(xkxi) after squaring the sum?

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