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

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

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Construction Planning and Management
Free float for any activity is defined as the difference between

its earliest finish time and earliest start time for its successor activity
its earliest finish time and latest start time for its successor activity
its latest start time and earliest start time
its latest finish time and earliest start time for its successor activity

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