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

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Industrial Engineering and Production Management
A big advantage of PERT over Gantt charts is that in the former case

Early start and late finish of an activity are clearly marked
Interrelationship among activities is clearly shown
Activities and events are clearly shown
Activity times are clear

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