To minimize the potential for gastrointestinal disease outbreaks, all passenger cruise ships arriving at U.S.

ports are subject to unannounced sanitation inspections. Ships are rated on a 100-point scale by the Centers for Disease Control. A score of 86 or higher indicates that the ship is providing an accepted standard of sanitation. The January 1999 sanitation scores for 121 cruise ships are listed in the table on p. 75. A MINITAB printout of descriptive statistics for the data is shown below.

a. Locate the mean and standard deviation on the MINITAB printout.

b. Calculate the intervals T f s, 2 f 2s, and 2 f 3s.

c. Find the percentage of mcasurements in the data set that fall within each of the intervals, part

b. Do these i

percentages agree with either Chebyshev's Rule or the Empirical Rule'?