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

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

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Industrial Engineering and Production Management
The important file in making a PERT is

All of the these
Length of arrow has nothing to do with time
An event can't be accomplished until activities leading to it are completed
No activity from any event can be started from preceding event till it is completed

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