Multiple-Choice Quiz Edward Dunn has to take a five-question multiple-choice qui

Question

Multiple-Choice Quiz Edward Dunn has to take a five-question multiple-choice quiz in his sociology class. Each question has four choices for answers, of which only one is correct. Assuming that Edward guesses on all five questions, what is the probability that he will answer a) all five questions correctly. b) exactly three questions correctly. TV Purchases At a Circuit City store, 1/4 of those purchasing color televisions purchase a large-screen TV. Determine the probability that none of the next four people who purchase a color television at Circuit City purchases a large-screen TV.

Explanation / Answer

2) P(getting a right answer in a question), p = 1/4

a) P(getting all questions correctly) = (1/4)5 = 0.001

b) P(exactly 3 correct questions) = 5C3 x 0.253 x 0.752 = 0.088

3) p = P(purchasing large screen TV) = 1/4

P(none of next 4 will purchase large screen TV) = (1-1/4)4 = 0.3164

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