For a data set obtained from a sample of size n = 144 with  x̄  = 50.25, it is known that σ = 4.2(a) What is the point estimate of μ? (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 μRound the answers to four decimal places. (d) What is the margin of error in part (c)?Round the answer to four decimal places.E =

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