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
Routing

Is concerned with starting of processes
Regulates the progress of job through various processes
Determines the programme for the operations
Prescribes the sequence of operations to be followed

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