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V 1, V 2, V 3 be unbiased estimators of a parameter . Var(V 1 ) = 1/2, Var(V 2 ) = 1 and Var(V

V1, V2, V3 be unbiased estimators of a parameter . Var(V1) = 1/2, Var(V2) = 1 and Var(V3) = 1/4. Moreover, Cov(Vi,Vj) = 0. The estimator T = b1V1+b2V2+b3V3.

Find b1, b2, b3 when T has minimum variance and unbiased.

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