b) Let Y be the mean of sample of size n from a normal distribution with mean y and variance 100. i. Find n so that P(/J50 0 ,elsewhere a) What is sampling frame distribution of W = Em?) (6 marks) b) Construct a 100(1a)% condence interval for A. (6 marks) 0) Suppose n = 10 and )7 = 90, nd the 90% interval estimate for it