Question: 3. (Queueing: single-server queue) At Olen's Caf, average service time is 40 seconds per customer and is exponentially distributed. Customers arrive at a mean rate

3. (Queueing: single-server queue) At Olen's Caf, average service time is 40 seconds per customer and is exponentially distributed. Customers arrive at a mean rate of 80 per hour and the rate is Poisson-distributed. Determine: a) The average number of customers waiting in line. b) The average time customers spend in the system. c) The probability of waiting in queue longer than 1 minute

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