Consider the following class of estimatorswsuba

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Consider the following class of estimators:

W(sub)a= 1/a1(Y1)+1/a2(Y2)+1/a3(Y3)+1/a4(Y4) where a(i) are the constants.

a) What restriction on the ai is needed for Wa to be an unbiased estimator of mu?

b) Find the variance of Wa.

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