1. A steady stream of eager fresh-faced students waits in line to register for classes before the start of fall semester classes. Students arrive at the rate of 10 per hour and it takes the duty of average of 3 minutes to check their student status, and register them for classes. The service time is exponentially distrbuted. What is the average utilizations of the server? a. 75% b. 90% c. 50% d.25% please help explain.