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A survey of Canadian teens aged 12 to 17 years reported that roughly 75% of them used a fee-based website to download music. You decide to interview a random sample of 15 U.S. teenagers. For now, assume that they behave similarly to the Canadian teenagers. (a) What is the distribution of the number X of teenagers who used a fee-based website to download music? Explain your answer (b) What is the probability that at least 12 of these 15 teenagers in your sample used a fee-based website to download music? (c) Suppose that only 60% of U.S. teenagers used a fee-based website to download music. If you interview 15 U.S. teenagers at ran dom, what is the mean of the number X of teenagers who used a fee-based website to download music? What is the standard deviation?

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Solution: Probability of a teen using a fee-based website to download music-p Sample size n 15 75% 0.75 Part-A: Mean of the dPart-C: Probability of a US teen using a fee-based website to download music: p Sample size n 15 6096-060 Mean number of teen

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