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

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Industrial Engineering and Production Management
Slack represents the difference between the

Proposed allowable time and the earliest expected time
Latest allowable time and the normal expected time
Latest allowable time and the earliest expected time
Normal allowable time and the latest expected time

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