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

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

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Industrial Engineering and Production Management
Micro motion study is

Analysis of a man-work method by using a motion picture camera with a timing device in the field of view
Study of man and machine conducted simultaneously
Motion study observed on enhanced time intervals
Motion study of a sequence of operations conducted systematically

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