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
20.143 minutes
27 minutes
21 minutes

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Construction Planning and Management
If the optimistic time, most likely time and pessimistic time for activity A are 4, 6 and 8 respectively and for activity B are 5, 5.5 and 9 respectively, then

expected time of activity A is greater than the expected time of activity B
None of these
expected time of activity B is greater than the expected time of activity A
expected time of both activities A and B are same

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