Industrial Engineering and Production Management
PERT

All of the listed here
Provides a way for management to require that planning be done on a uniform and logical basis
Provides an approach for keeping planning up-to-date
Permits management to foresee quickly the impact of variations from the plan

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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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