A repair and maintenance facility, Poisson arrival and service rates. And it works according to the first-come-first-served discipline. Applications for the service are equal to an average of 1-3 per day. The facility can service an average of -6 machines per day. A. The utilization factor of the service facility (%U) B. The average time in the system Ts C. The average number of Ns in the system is D. Average waiting time in the queue Tq E. The probability that there are n-2 machines in the system F. The expected number in the queue is Nq Calculate the time during which the service facility remains idle, (percentage)