Two nurses at Northwood Hospital's Cardiac Care Unit are assigned to care for eight patients. Nurses are responsible for administering medication, taking vital signs, and responding to frequent calls for assistance that can come either from the patient or from the equipment monitoring the patient's current condition. On average, each patient requires attention three times each hour. Nurses average 6 minutes per patient visit.

a. What is the average utilization of the nursing staff?

b. On average, how many patients are waiting for a nurse?

c. By how much would adding a third nurse reduce the patient waiting time?