Efficient manufacturing: Efficiency experts study the processes used to manufacture items in order to make them as efficient aspossible. One of the steps used to manufacture a metal clamp involves the drilling of three holes. In a sample of 95 clamps, themean time to complete this step was 55.3 seconds. Assume that the population standard deviation is = 12 seconds. Round thecritical value to no less than three decimal places. Part 1 of 2(a) Construct an 80% confidence interval for the mean time needed to complete this step. Round the answer to at least onedecimal place.An 80% confidence interval for the mean is