what is e?

There is only one copying machine in the student lounge of the business school. Students arrive at the rate of 2 - 40 per hour (according to a Poisson distribution). Copying takes an average of 40 seconds, or p = 80 per hour (according to a negative exponential distribution) a) The percentage of time the machine is used = 44 percent (round your response to the nearest whole number). b) The average length of the queue = 0.36 students (round your response to two decimal places). c) The average number of students in the system = 0.8 students (round your response to two decimal places). d) The average time spent waiting in the queue = 0.53 minutes (round your response to two decimal places) e) The average time in the system - minutes fround your response to two decimal places)