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What kinds of Web sites do males aged 18 to 34 visit most often? Pornographic sites take ?rst place, but about 50% of male Internet users in this age group visit an auction site such as eBay at least once a month.2 Interview a random sample of 15 male Internet users aged 18 to 34.

(a) What is the distribution of the number who have visited an online auction site in the past month?

(b) What is the probability that at least 8 of the 15 have visited an auction site in the past month?

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