THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Consider the following point estimators,W,X,Y,and Z of μ: W = (x₁ + x₂) /2;
X = (2x₁ + x₂) /3;Y = (x₁ + 3x₂) /4;and Z = (2x₁ + 3x₂) /5.
-Which of the following point estimators is the most efficient?

A) W
B) X
C) Y
D) Z