Construction Planning and Management
At a work site, statistical quality control of concrete means

Measurement of risks to eliminate failures
Applying the theory' of probability to sample testing or inspection
Reduction in wastage of inspection costs
Reduction in costs for the removal of defects

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Construction Planning and Management
Earliest finish of an activity is always

Greater than or equal to earliest event time of the following node
Less than earliest event time of the following node
Less than or equal to earliest event time of the following node
Greater than earliest event time of the following node

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