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Chapter 5: Q .82. (page 341)

Media usage and good grades The Kaiser Family Foundation released a study about the influence of media in the lives of young people aged 8鈭�18. 20 In the study, 17% of the youth were classified as light media users, 62% were classified as moderate media users, and 21% were classified as heavy media users. Of the light users who responded, 74% described their grades as good (A鈥檚 and B鈥檚), while only 68% of the moderate users and 52% of the heavy users described their grades as good. Suppose that we select one young person from the study at random.

a. Draw a tree diagram to model this chance process.

b. Find the probability that this person describes his or her grades as good.

c. Suppose the chosen person describes his or her grades as good. What鈥檚 the probability that he or she is a heavy user of media?

Short Answer

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Part a)

Part b)

Part c)

Step by step solution

01

Part (a)Step 1:Given information

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