3. QSR Magazine studied drive-through times for fast-food restaurants and found Wendy's had the best time,...
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3. QSR Magazine studied drive-through times for fast-food restaurants and found Wendy's had the best time, with a mean time spent in the drive-through of 138.5 seconds. Assume drive-through times are normally distributed with a standard deviation of 29 seconds. a. Determine the probability that a randomly selected car will get through Wendy's drive- through in less than 100 seconds. b. Determine the proportion of cars that spend between 2 and 3 minutes in Wendy's drive- through. C. Would it be unusual for a car to spend more than 3 minutes in Wendy's drive-through? Explain. Show all your work. d. Suppose that Wendy's wants to institute a policy that it will not charge any patron that must wait more than a certain amount of time for an order. Management does not want to give away free meals to more than 1% of the patrons. What time should Wendy's advertise as the maximum wait time before a free meal is awarded? 3. QSR Magazine studied drive-through times for fast-food restaurants and found Wendy's had the best time, with a mean time spent in the drive-through of 138.5 seconds. Assume drive-through times are normally distributed with a standard deviation of 29 seconds. a. Determine the probability that a randomly selected car will get through Wendy's drive- through in less than 100 seconds. b. Determine the proportion of cars that spend between 2 and 3 minutes in Wendy's drive- through. C. Would it be unusual for a car to spend more than 3 minutes in Wendy's drive-through? Explain. Show all your work. d. Suppose that Wendy's wants to institute a policy that it will not charge any patron that must wait more than a certain amount of time for an order. Management does not want to give away free meals to more than 1% of the patrons. What time should Wendy's advertise as the maximum wait time before a free meal is awarded?
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Statistics for Managers Using Microsoft Excel
ISBN: 978-0133130805
7th edition
Authors: David M. Levine, David F. Stephan, Kathryn A. Szabat
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