Part B (5 marks): Questions 8, 9 and 10 are to be answered using the following information. Let X1, X2, ..., X, be a random sample of size n with mean ji and variance o?. X denotes the sample average. Consider the estimator W for pe where W = X + 2. Question 8 2 pts What is E(W)? O/2 O2u - 2 OO + 2 Question 9 1 pts Wis an unbiased estimator. True False - Question 10 2 pts What is Var(W)? OOP 2n Q . o o -15 ? ?O 1 o o 0