Auto vehicles arrive at a petrol pump, having one petrol unit, in Poisson fashion with an average of 10 units per hour. The service time is distributed exponentially with a mean of 3 minutes. Find the following: i. Average number of units in the system ii. Average waiting time iii. Average length of queue iv. Probability that a customer arriving at the pump will have to wait v. The utilization factor for the pump unit vi. Probability that the number of customers in the system is 2.

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter12: Queueing Models
Section12.5: Analytic Steady-state Queueing Models
Problem 9P
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Auto vehicles arrive at a petrol pump, having one petrol unit, in Poisson fashion with an
average of 10 units per hour. The service time is distributed exponentially with a mean of
3 minutes. Find the following:
i. Average number of units in the system
ii. Average waiting time
iii. Average length of queue
iv. Probability that a customer arriving at the pump will have to wait
v. The utilization factor for the pump unit
vi. Probability that the number of customers in the system is 2.

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9781337406659
Author:
WINSTON, Wayne L.
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Cengage,