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Business, 31.08.2019 04:20 sascsl7973
The amount of time that a drive-through bank teller spends on a customer is a random variable with a mean µ = 3.2 minutes and a standard deviation σ = 1.6 minutes. if a random sample of 64 customers is observed, find the probability that their mean time at the teller’s 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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