374) A Maintenance Service Facility Has Poisson Arrival Rates, Negative Exponential Service Time And Operates On A ‘first Come First Served’ Queue Discipline. Break Downs Occur On An Average Of 3 Per Day With A Range Of Zero To Eight. The Maintenance Crew Can Service An Average Of 6 Machines Per Day With A Range Of Zero To Seven. The Mean Waiting Time For An Item To Be Serviced Would Be