Mount Sinai Hospitals orthopedic care unit has 5 beds, which are virtually always occupied by patients who

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Mount Sinai Hospital’s orthopedic care unit has 5 beds, which are virtually always occupied by patients who have just undergone orthopedic surgery. One registered nurse is on duty in the unit in each of the three 8-hour shifts. About every 2 hours (following a Poisson distribution), one of the patients requires a nurse’s attention.

The nurse will then spend an average of 30 minutes (negative exponentially distributed) assisting the patient and updating medical records regarding the problem and care provided.

Because immediate service is critical to the 5 patients, two important questions are: What is the average number of patients either waiting for or being attended by the nurse? What is the average time that a patient spends waiting for the nurse to arrive?

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