Industrial Engineering and Production Management
Work sampling is applied for

Finding out time standards, specially where the job is not repetitive and where time study by stop watch method is not possible
Estimating the percentage of the time consumed by various job activities
Estimation of the percentage utilization of machine tools
All of these

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

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