(a) Find the z value for 57.30. Round the answer to two decimal places. Z1= (b) Find the z value for 67.71. Round the answer to two decimal places. Z2 = 1For a data set obtained from a sample of size n = 100 with x = 48.75, it is known that o = 5.0. (a) What is the point estimate of u? U = (b) Find z score corresponding to a 95% confidence level, Za/2. Recall that (1 - a) 100% = 95%. Round the answer to two decimal places. Z : (c) Construct a 95% confidence interval for H. Round the answers to four decimal places.