Question: Assuming that E[=1 X?] = n(2 + ?), that E[=1X2] = n (n + ?), and that [=1X Xi] = E[nX?] = n(= +

Assuming that E[=1 X?] = n(2 + ?), that E[=1X2] = n 

Assuming that E[=1 X?] = n(2 + ?), that E[=1X2] = n (n + ?), and that [=1X Xi] = E[nX?] = n(= + ?), please simplify [=1 X?] 2E[=1X X] + [=1X2].

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