Question

The management at Ohio National Bank does not want its customers to wait in line for service for too long. The manager of a branch of this bank estimated that the customers currently have to wait an average of 8 minutes for service. Assume that the waiting times for all customers at this branch have a normal distribution with a mean of 8 minutes and a standard deviation of 2 minutes.
a. Find the probability that a randomly selected customer will have to wait for less than 3 minutes.
b. What percentage of the customers have to wait for 10 to 13 minutes?
c. What percentage of the customers have to wait for 6 to 12 minutes?
d. Is it possible that a customer may have to wait longer than 16 minutes for service? Explain.


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  • CreatedAugust 25, 2015
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