Suppose that E (X1) = E(X2) = E(X3) = µ, Var(X,) = 5, Var(X2) = 8, and Var(X3) = 13. Find c so that the point estimate âu to u is unbiased, then calculate the mean square error of the %3D point estimate: i = X, +X2 + cX3.

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