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Please answer a question about point estimator in statistics and probability. fLet 9'1 = X1 + X2 + X3 + X4 and 62 = X1

Please answer a question about point estimator in statistics and probability.

\fLet 9'1 = X1 + X2 + X3 + X4 and 62 = X1 X2 X3 X4 be two estimators of a. (1) Find the MSE of 61. (2) Find the MSE of 62. (3) Which estimator is better

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