Let {x .,x } is a random sample coming from N(μ, σ^), and suppose σ is known. (a) Show that hat(e) = x n 2 is an unbiased estimator for u. (b) Find the efficiency of hat(e). ง C 5. Let {X1, X2,. ,Xn} is a random sample coming from N(μ, o²), and suppose σ² is known. .... (a) Show that = x² - 2 is an unbiased estimator for μ². (b) Find the efficiency of Ô.

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A: given data P(A') =0.4P(B') = 0.5P(A∩B) = 0.4

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