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

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

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Industrial Engineering and Production Management
Critical Path Net Work helps an engineer

To divert the resources from noncritical advanced activities to critical activities
All of these
To concentrate his attention on critical activities
To be cautious for avoiding any delay in the critical activities to avoid delay of the whole project

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