Construction Planning and Management
If to, tp and tm are the optimistic, pessimistic and most likely time estimates of an activity respectively, the expected time t of the activity will be

to + 4tm+ tp/4
to + 4tm+ tp/5
to + 4tm+ tp/6
to + 3tm+ tp/3

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

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

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