need help w the whole thing

For a data set obtained from a sample of size n = 144 with T = 44.25, it is known that o = 5.5. (a) What is the point estimate of u? u= i 0.4583 (b) Find z score corresponding to a 95% confidence level.za/2. Recall that (1 - a) 100% = 95%. Give your answer with two decimal places. Z= (c) Construct a 95% confidence interval for u. Round the answers to four decimal places. (d) What is the margin of error in part (c)? Round the answer to four decimal places. E E =