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

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

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Industrial Engineering and Production Management
Pessimistic time is

The minimum time in which an activity can possibly be accomplished
The most probable time considering all conditions
The average time required for a job
The maximum time which an activity might require

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