Consider an urgent care center with 4 doctors where the average arrival rate for each doctor is 24 patients per hour and the average service time of each patient is 2 minutes. Both inter-artival times and service times have a coefficient of varlation equar to one. Initioly, ebch doctor serves his or her own patients. Noting that there are 4 separate but identical queues in total, what is the average number of potients in the urgent care center including those waiting in line to see a doctor as well as those who are seeing a doctor)? Fill in the blank