In an opencast mine dumpers arrive at a shovel location with...

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In an opencast mine, dumpers arrive at a shovel location with an average arrival rate of 12 per/hour. The inter-arrival times of the dumpers follow an exponential distribution. The service times of the shovel also follow an exponential distribution with an average of 3 minute. The average waiting time of a dumper in the queue in minutes is

A. 2.7

B. 6

C. 4.5

D. 7.5

Answer: Option C

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