Answer:
Now, if you read the textbook on page 298 there is a statement that says X bar or it's the sample Mean the sample mean expert is an unbiased estimator off moon. This is the straightaway sentence given in the textbook. So which statistic is the best unbiased estimator for immune? I think we have option B over here. Option B. This is expert. So expert is the most unbiased and the best unbiased estimated for milk. So be is going to be our answer.