The amount of time that a drive‐through bank teller spends on a customer is a random variable with a mean of 6.7 minutes and a standard deviation of 3.2 minutes. If a random sample of 64 customers is observed, find the probability that their mean time at the teller’s window is: At most 5.7 minutes

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The amount of time that a drive‐through bank teller spends on a customer is a random variable
with a mean of 6.7 minutes and a standard deviation of 3.2 minutes. If a random sample of 64
customers is observed, find the probability that their mean time at the teller’s window is:

At most 5.7 minutes

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