(Answered) The amount of time that a drive-through bank teller spends

Finance

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 s = 1.6 minutes. If a random sample of 64 customers is observed, find the probability that their mean time at the teller's counter 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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