Quiz Chapeter 6.docx - Chapter 6 Quiz Question 1 A total of 60 of the customers of a fast food chain order a hamburger French fries and a drink If a

# Quiz Chapeter 6.docx - Chapter 6 Quiz Question 1 A total of...

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Chapter 6 Quiz Question 1 A total of 60% of the customers of a fast food chain order a hamburger, French fries, and a drink. If a random sample of 15 cash register receipts is selected, what is the probability that 10 or more will show that the above three food items were ordered? 0.403 Applying the binomial distribution, go to the binomial probability table, find the case where the number of trials is n = 15, and the probability of success is π = .60. Find the row where x, the number of successes, is 10. Finally, add the probabilities for 10 through 15 successes (.186 + .127 + … + .005 + .000). The result is .403. Question 2 Judging from recent experience, 5% of the computer keyboards produced by an automatic, high-speed machine are defective. If six keyboards are randomly selected, what is the probability that none of the keyboards are defective? 0.735 Applying the binomial distribution, go to the binomial probability table, find the case where the number of trials is n = 6, and the probability of success is π = .05. Find the row where x, the number of successes, is 0. The answer is .735. Question 3 Which one of the following is NOT a condition of the binomial distribution? Sampling at least 10 trials All are conditions for a binomial distribution except that there is no requirement regarding the number of trials. Question 4 Which is true for a binomial distribution? The probability of success remains the same from trial to trial. In the set of answers, all are false except that the probability of success is the same for each trial in a binomial distribution. Question 5 Sponsors of a local charity decided to attract wealthy patrons to its \$500-a-plate dinner by allowing each patron to buy a set of 20 tickets for the gaming tables. The chance of winning a prize for each of the 20 plays is 50-50. If you bought 20 tickets, what is the chance of winning 15 or more prizes? 0.021 Apply the binomial distribution where the number of trials is n = 20, and the probability of success is π = .50. Use the binomial probability formula to find the probabilities of winning 15
or more prizes. That is .015 + .005 + .001 + .000 + .000 = .021. Question 6 Carlson Jewelers permits the return of their diamond wedding rings, provided the return occurs within two weeks of the purchase date. Their records reveal that 10% of the diamond wedding rings are returned. Five different customers buy a wedding ring. What is the probability that none of the customers return a ring?

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