A movie site investigates the types of movie their customers buy, they record the cus- tomer's age and the movie genre of 240 customers. Suppose the data break down as follows Practice q #22 p.197 chap 7 a. Age 12-20 21-29 30-39 40-49 50 and over documentary? Type of Movie Documentary Comedy 14 9 15 14 9 21 7 22 6 38 A range 21-29 years old, what is the probability that a person bought a b. Among people who bought documentaries what is the probability that the person was 21-29 years old? Mystery 8 9 39 17 12

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