Solve using appropriate formulas

We have three independent random variables X1, X2, and X3. Suppose that E(X1) = 0.4a, Var(X1)=2, E(X2) = 0.2g, Var(X2) = 2, 130(3) = t1, Var(X3) = 5. Consider the point estimate: A 1 1 5 #1 : 2X1 +X2 +6X3 a. Calculate the bias of the point estimate. Is ll unbiased? Explain. 1'). Calculate the variance of the point estimate It. . (2. Calculate the mean square error ofthe point estimate if \"=2