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Unformatted text preview: of rentals (movies and games)
of a randomly chosen household in a week is greater than three.
(b) Find the marginal probability distribution of X .
(c) Find the expected value, and standard deviation of X .
(d) 100 households are randomly selected. Find the probability that the total number
of movies rented in a week by these households is 160 or fewer.
3 Problem 8. A survey of 50 people at a movie theater showed that 38 of them bought
popcorn at the theater.
(a) Find the point estimate for the proportion p of people who buy popcorn at the
(b) Calculate the 90% conﬁdence interval for p.
(c) You want to conduct another survey to estimate p to within 5% with 90% conﬁdence. How large should your sample size be? Problem...
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