### Calculate the percentage utilization of graduate student

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A study-aid desk staffed by a graduate student has been established to answer students' questions and help in working problems in your OSCM course. The desk is staffed eight hours per day. The dean wants to know how the facility is working. Statistics show that students arrive at a rate of five per hour and the distribution is approximately Poisson. Assistance time averages 5 minutes, distributed exponentially. Assume population and line length can be infinite and queue discipline is FCFS.

Utilization of the graduate student             %

b. Calculate the average number of students in the system, excluding the graduate student service. (Round your answer to 1 decimal place.)

Average number of students

c. Calculate the average time in the system. (Round your answer to 1 decimal place.)

Average time in the system             minutes

d. Calculate the probability of four or more students being in line or being served. (Round your intermediate calculations to 3 decimal places and final answer to 1 decimal place.)

Probability             %

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