Solved: The amount of time that a drive-through bank
Chapter 9, Problem 8.26(choose chapter or problem)
The amount of time that a drive-through bank teller spends on a customer is a random variable with a mean =3 .2 minutes and a standard deviation =1 .6 minutes. If a random sample of 64 customersis observed, nd the probability that their mean time at the tellers window is (a) at most 2.7 minutes; (b) more than 3.5 minutes; (c) at least 3.2 minutes but less than 3.4 minutes.
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