Early Morning Delivery Service guarantees delivery of small packages by 10:30 A.M. Of

Chapter 0, Problem 26

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Early Morning Delivery Service guarantees delivery of small packages by 10:30 A.M. Of course, some of the packages are not delivered by 10:30 A.M. For a sample of 200 packages delivered each of the last 15 working days, the following number of packages were delivered after the deadline: 9, 14, 2, 13, 9, 5, 9, 3, 4, 3, 4, 3, 3, 8, and 4. a. Determine the mean proportion of packages delivered after 10:30 A.M. b. Determine the control limits for the proportion of packages delivered after 10:30 A.M. Were any of the sampled days out of control? c. If 10 packages out of 200 in the sample were delivered after 10:30 A.M. today, is this sample within the control limits?

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