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

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Industrial Engineering and Production Management
The basic difference between PERT and CPM is that

PERT deals with events and CPM with activities
Costs are considered on CPM only and not in PERT
Critical path is determined in PERT only
Guessed times are used in PERT and evaluated times in CPM

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