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Students arrive at the School Office at an average of one student every 15 minutes, and...

Students arrive at the School Office at an average of one student every 15 minutes, and their requests take on average 10 minutes to be processed. The service counter is staffed by only one clerk, Linda Jones, who works eight hours per day and gets paid $75 per day.

a) On average, how many students go to the School Office per day?                  
b) How much time, on average, does a student spend waiting in line?     

c) How many minutes a day is Linda not busy?                                       

d) What is the probability that an arriving student (just before entering the School Office) will find at least one other student waiting in line?

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