Construction Planning and Management
A father notes that when his teenage daughter uses the telephone, she takes not less than 6 minutes for a call and som? times as much as an hour. Fifteen minutes call are more frequent than calls of any other duration. If these phone calls were an activity in PERT project, then phone calls expected duration will be

15 minutes
27 minutes
21 minutes
20.143 minutes

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

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

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