Industrial Engineering and Production Management
Activity slack or float of any event on a PERT/CPM chart is represented by

Anyone of the above
Latest start time of succeeding event earliest finish time of preceding event activity time
Latest start time of the event earliest start time of the event
Latest finish time of event earliest finish time of the event

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

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