Need an answer for B

Students arrive at the Administrative Services Office at an average of one every 15 minutes, and their requests take, on average, 8 minutes to be processed. The service counter is staffed by only one clerk, Judy Gumshoes, who works eight hours per day. Assume Polsson arrivals and exponential service times. Q. What percentage of time is Judy idle? Note: Round your answer to 1 decimal place. Answer is complete and correct. b. How much time, on average, does a student spend wolting in ine? Note: Do not round intermedlate calculations. Round your enswer to 1 decimal place. c. How long is the (watting) line, on average? Note: Pound your answer to 2 decimal pleces. stucent waing in line? Note: Do not round intermediete colculetions. Round your answer to 4 decimel pleces