Problem D.2 Question Help There is only one copying machine in the student lounge of the business school. Students arrive at the rate of 3 = 50 per hour (according to a Poisson distribution). Copying takes an average of 40 seconds, or u = 90 per hour (according to a negative exponential distribution). a) The percentage of time the machine is used = 56 percent (round your response to the nearest whole number). b) The average length of the queue = students (round your response to two decimal places). Enter your answer in the answer box and then click Check Answer. parts remaining Clear All Check