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PLEASE PROVIDE COMPLETE SOLUTIONS,EXPLANATIONS AND ILLUSTRATION. Federal Service advertises that its average delivery time is 30 hours, while United Express claims its average is 34

PLEASE PROVIDE COMPLETE SOLUTIONS,EXPLANATIONS AND ILLUSTRATION.
Federal Service advertises that its average delivery time is 30 hours, while United Express claims its average is 34 hours. However, United Express' arrival times are more consistent because the standard deviation of its delivery time is only 2 hours, whereas the standard deviation of Federal's time is 5 hours. Which service should we use if our document must arrive within 36 hours

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