The following table of probabilistic time estimates (in weeks)and activity predecessors are provided for a project.

Table 9.2
-Using Table 9.2,the earliest start (ES)time for activity D is
A)8.17 weeks.
B)12.67 weeks.
C)18.33 weeks.
D)21.67 weeks.

Question

The following table of probabilistic time estimates (in weeks)and activity predecessors are provided for a project.
 
Table 9.2
-Using Table 9.2,the earliest start (ES)time for activity D is
A)8.17 weeks. 
B)12.67 weeks. 
C)18.33 weeks. 
D)21.67 weeks.

Quizplus · Accepted Answer

In order to determine the earliest start time (ES) for activity D, we need to consider its predecessors (activities A, B, and C). The ES for activity D is equal to the maximum of the earliest finish times (EF) for its predecessors.

- The EF for activity A is 8.67 weeks (its duration of 5 weeks plus ES of 3.67 weeks).
- The EF for activity B is 12.67 weeks (its duration of 4 weeks plus ES of 8.67 weeks).
- The EF for activity C is 14.17 weeks (its duration of 1.5 weeks plus ES of 12.67 weeks).

Therefore, the ES for activity D is 12.67 weeks (the maximum of these EF values).

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