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Q3. Let X1, X2, and X3 represent three values that are drawn randomly and independently from a large population with a mean ofp. and a variance of 02. Consider the following point estimators of the population mean: W=0.10X1+0.50X2+0.40X3 Z=0.25X1+0.25X2+0.50X3 A. Show that both estimators are unbiased. (3 points) B. Briefly define what it means for one estimator to be more efficient than another. (3 points) C. Demonstrate and explain which of the two estimators is more efficient. (4 points)