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 latest (as of Jan. 2010) sanitation scores for 186 cruise ships are saved in the accompanying file. The first five and last five observations in the data set are listed in the accompanying table.

a. Generate both a stem-and-leaf display and histogram of the data.
b. Use the graphs to estimate the proportion of ships that have an accepted sanitation standard. Which graph did you use?
c. Locate the inspection score of 69 (Albatross) on the graph. Which graph did you use?

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Ship Name Sanitation Score Adventure of the Seas AIDAaura Albatross Amadea Amsterdam 98 100 69 Westerdam Wind Spirit Wind Sur Zuiderdanm