In order to determine the average weight of carry-on luggage by passengers in airplanes, a sample of 25 pieces of carry-on luggage was collected and weighed. The average weight was 18 pounds. Assume that we know the standard deviation of the population to be 7.5 pounds. Determine a 97% confidence interval estimate for the mean weight of the carry-on luggage (rounded off to two decimals).    A. [15.75 ; 21.35]  B. [14.75 ; 21.26]  C. [15.17 ; 20.83]  D. [14.06 ; 21.94]

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