15. Express Courier Service has found that the delivery time for packages is normally distributed, with mean 14 hours and standard deviation 3 hours. (b) What should be the guaranteed delivery time on all packages in order to be 90% sure that the package will be delivered before this time? (Hint: Note that 10% of the packages will be delivered at a time beyond the guaranteed time period.) (Round your answer to one decimal place.)

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15. Express Courier Service has found that the delivery time for packages is normally distributed, with mean 14 hours and standard deviation 3 hours.

(b) What should be the guaranteed delivery time on all packages in order to be 90% sure that the package will be delivered before this time? (Hint: Note that 10% of the packages will be delivered at a time beyond the guaranteed time period.) (Round your answer to one decimal place.)

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