Industrial Engineering and Production Management
The reasons which are basically responsible for the formation of a queue should be that

Output rate is constant and the input varies in a random manner
Output rate is linearly proportional to input
The average service rate Hess than the average arrival rate
All of these

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Industrial Engineering and Production Management
Work sampling is applied for

All of these
Estimating the percentage of the time consumed by various job activities
Estimation of the percentage utilization of machine tools
Finding out time standards, specially where the job is not repetitive and where time study by stop watch method is not possible

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