Sanitation inspection of cruise ships. 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 and Prevention. A score of 86 or higher indicates that the ship is providing an accepted standard of sanitation. The May 2006 sanitation scores for 169 cruise ships are saved in the SHIPSANIT file. The first five and last five observations in the data set are listed in the accompanying table.

(a) Generate a stem-and-leaf display of the data. Identify the stems and leaves of the graph.

(b) Use the stem-and-leaf display to estimate the proportion of ships that have an accepted sanitation standard.

(c) Locate the inspection score of 84 (Sea Bird) on the stem-and-leaf display.

(d) Generate a histogram for the data.

(e) Use the histogram to estimate the proportion of ships that have an accepted sanitation standard.