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
The average service rate Hess than the average arrival rate
Output rate is linearly proportional to input
All of these

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Industrial Engineering and Production Management
Work study is mainly aimed at

Economizing the motions involved on the part of the worker while performing a job
Establishing the minimum time of completion of a job
Determining the most efficient method of performing a job
Developing the standard method and standard time of a job

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