In the library MASS you find the data frame "ships giving the number of damage incidents and aggregate months of service by ship type, year of cons > ships type year period service incidents A 60 60 0 1 127 2 A 60 75 63 0 3 65 60 1095 3 4 A 65 75 1095 4 Find the average service time: Find the 90%-confidence interval for the mean of "service" (aggregate months of service): 1 (answers with at least 3 decimal places! Find the 99%-confidence interval for the mean of "incidents (answers with at least 3 decimal places!)