The following table of probabilistic time estimates (in weeks)and activity predecessors are provided for a project.
Table ZZ
-Using Table ZZ,how much slack is associated with activity C?
A)0 weeks.
B)4.50 weeks.
C)12.67 weeks.
D)31.00 weeks.

Question

The following table of probabilistic time estimates (in weeks)and activity predecessors are provided for a project.
  Table ZZ
-Using Table ZZ,how much slack is associated with activity C?
A)0 weeks. 
B)4.50 weeks. 
C)12.67 weeks. 
D)31.00 weeks.

Quizplus · Accepted Answer

Slack is the amount of time an activity can be delayed without affecting the project completion time. To calculate slack, subtract the duration of the activity from the difference of the latest finish time of the activity and the earliest finish time of its successor activities. In this case, the earliest finish time of activity C is week 17 and the latest finish time is week 23. The duration of activity C is 6 weeks. The latest finish time of activity D is week 40. Therefore, the slack for activity C is (23 - 17) - 6 = 0 weeks. However, this assumes that activity D will finish at its latest possible time. If activity D finishes earlier, there will be some slack available for activity C. The maximum amount of slack is 4.5 weeks, which is the difference between the earliest and latest finish times of activity D (35 - 30) minus the duration of activity C (6). Therefore, the best choice is B.

The Following Table of Probabilistic Time Estimates (In Weeks)and Activity