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 240 packages delivered each of the last 15 working days, the following numbers of packages were delivered after the deadline: 9, 18, 3, 11, 7, 4, 5, 9, 6, 4, 6, 2, 7, 6, and 6. (Leave no cells blank - be certain to enter "0" wherever required. Round your answers to 3 decimal places.)

a.	Determine the mean proportion of packages delivered after 10:30 A.M.
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b.	Determine the control limits for the proportion of packages delivered after 10:30 A.M.
	UCL = LCL =