In a single-server queuing system, if 12 customers arrive per hour and 30 customers are served per hour, what is the probability that there are no customers in the system?
A crew of mechanics at the Department of Transportation garage make minor repairs to snowplows during the winter. The snowplows break down at an average rate of 4 vehicles per day and breakdowns are distributed according to the Poisson distribution. The mechanic can service an average of 7 vehicles per day with a repair time distribution that approximates a negative exponential distribution. Assume an 8 hour day.
A) 0.75
B) 0.60
C) 0.40
D) 0.2 5
Answer: B
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All of the following are choices managers need to make when developing an effective performance appraisal system EXCEPT ________
A) what to evaluate B) whether to use formal or informal appraisals C) which methods of appraisal to use D) how to appraise the quality of outputs