Industrial Engineering and Production Management
PERT

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

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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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