**Transcribed Image Text: **Patients arrive randomly at an eye care clinic for eye exam. Suppose that there is only one optometrist. The time required for the exam varies from patient to patient. Arrivals have been found to follow the Poisson process (i.e., exponentially distributed inter-arrival times), and the service times follow the exponential distribution. The average arrival rate is 12 patients per hour, and the average service rate is 20 patients per hour. A patient wait in a waiting room until the optometrist is ready to see them. How many patients, on the average, will be in the waiting room? 4. 1.5 3 0.9 36

**More** **Transcribed Image Text: **Patients arrive randomly at an eye care clinic for eye exam. Suppose that there is only one optometrist. The time required for the exam varies from patient to patient. Arrivals have been found to follow the Poisson process (i.e., exponentially distributed inter-arrival times), and the service times follow the exponential distribution. The average arrival rate is 12 patients per hour, and the average service rate is 20 patients per hour. A patient wait in a waiting room until the optometrist is ready to see them. How many patients, on the average, will be in the waiting room? 4. 1.5 3 0.9 36