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The Quick Snap photo machine at the Lemon County bus station takes four snapshots in exactly 75 seconds.Customers arrive at the machine according to a Poisson distribution at the mean rate of 20 per hour.On the basis of this information,determine
a.the average number of customers waiting to use the photo machine.
b.the average time a customer spends using the system.
c.the probability an arriving customer must wait for service.
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