In order to determine the average weight of carry-on luggage by passengers in airplanes, a sample of 60 pieces of carry-on luggage was collected and weighed. The average weight was 23.5 pounds. Assume that we know the standard deviation of the population to be 4.25 pounds. Also, assume the population is normally distributed. (Round your answers to three decimal places.) (a) Determine a 99% confidence interval estimate for the population mean weight (in pounds) of the carry-on luggage. pounds to pounds (b) Determine a 95% confidence interval estimate for the population mean weight (in pounds) of the carry-on luggage. pounds pounds to

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