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

21 minutes
15 minutes
20.143 minutes
27 minutes

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Construction Planning and Management
Batching refers to

Controlling the quantity of each material into each batch
Adjusting the water to be added in each batch according to the moisture content of the materials being mixed in the batch
Weighing accurately, the quantity of each material for a job before mixing
Controlling the total quantity at each batch

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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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