Probability that average time spent per customer is in range

Reference no: EM13148117

The amount of time a bank teller spends with each customer has a mean of 3.10 minutes and standard deviation of 0.45 minutes. A random sample of 36 customers is selected. What is the probability that the average time spent per customer is between 2.9 and 3.2 minutes?

Reference no: EM13148117

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