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

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Industrial Engineering and Production Management
The essential condition for the decompression of an activity is that

After decompression the time of an activity invariably exceeds its normal time
An activity could be decompressed to the maximum extent of its normal time
An activity could be decompressed to the maximum extent of its normal time
The project time should change due to decompression

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