Construction Planning and Management
If the expected time of completion of a project is 60 weeks with a standard deviation of 5 weeks, the probability of completing the project in 50 weeks and 65 weeks respectively will be

15.9% and 97.7%
2.3% and 84.1%
97.7% and 84.1%
97.7 % and 15.9%

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Construction Planning and Management
Whenever an activity has zero total float, then

Independent float must be zero but free float need not be zero
Free float and independent float both must be zero
Free float of the activity must be zero but independent float need not be zero
Free float and independent float both need not be zero

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