The student's arrival pattern to the computer Info-Desk has Poisson Distribution with the rate of 1 student per hour. Each computer technician of the Info-Desk can help 0.40 students per hour in average (according to an exponential distribution). Assume there are 4 technicians available: a. Compute the average time each student has to wait in the queue to receive support from the Info-Desk. b. Compute the average time students spend in the system to receive support from the Info-Desk