CHAPTER4PRACTICEPROBLEMsMATH40SP11(2)

# CHAPTER4PRACTICEPROBLEMsMATH40SP11(2) - PRACTICE PROBLEMS...

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(1) A large chain bookstore wishes to determine how much of its floor space to use for books, and how much for games and movies. 500 customers are asked if they visit the store primarily for books, or primarily for games and movies. The customers are also divided by age group. The results of this survey are shown in the contingency table below: Books Total Under 20 years old 80 120 200 20 years old or more 240 60 300 Total 320 180 500 One customer is selected at random. Find the following probabilities. Express your answers as percents . (a) The person is under 20 years old and primarily visits the store for books. (b) The person is under 20 years old or primarily visits the store for games and movies. (c) The person visits the store primarily for books, given that he is 20 years old or more. (d) The person is 20 years old or more, given that he visits the store primarily for books. (e) Are age group and primary merchandise statistically independent events?

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CHAPTER4PRACTICEPROBLEMsMATH40SP11(2) - PRACTICE PROBLEMS...

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