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Why is E[Sum i=1 to n of X_Bar X_i] = E[x_bar sum i=1 to n of X_i] = E[nX_bar^2] Why is E [ XX. -

Why is E[Sum i=1 to n of X_Bar X_i] = E[x_bar sum i=1 to n of X_i] = E[nX_bar^2]

Why is E [ XX. - E x x. = = [nx' ]

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