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

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

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Industrial Engineering and Production Management
Work sampling is applied for

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

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