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 20 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 15 of these 20 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 20 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?
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 20 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 15 of these 20 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 20 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?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
![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 20 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 15 of these 20 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 20 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?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbda6b4fa-e1e9-467f-9a5e-b4b71d7c135a%2F3e8c3a5c-4276-4db3-b02a-050cd2f5db7f%2Fpji2u7_processed.png&w=3840&q=75)
Transcribed Image Text: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 20 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 15 of these 20 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 20 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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