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The amount of time a bank teller spends with each customer has a population mean,, of 3.10 minutes and population standard deviation, of 0.40 minute.

The amount of time a bank teller spends with each customer has a population mean,, of 3.10 minutes and population standard deviation, of 0.40 minute. If you select a random sample of 16 customers,

What is the probability that the mean time spent per customer is at least 3 minutes?

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