The following activity time estimates, in days, are for a construction project planned by Curtis Construction Company:

Required:
(1) Compute the expected completion time for activity 3-4.
(2) Construct a PERT network of the activities and events necessary to complete the construction project.
(3) Determine the estimate time required to complete each path through the PERT network, and identify the critical path.
(4) What is the slack time for event 2?

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Activity tmost optimistic time mmost likely time 0-1 most pessimistic time estimated completion time 2-6 3-4 3-5 4-6 4-7 5-7 6-7 6 6 6 2 6