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

To calculate the earliest start time for activity D, we need to add up the duration of all its predecessors and select the largest value as the earliest start time. The predecessors for activity D are B and C.

Duration of activity B = 5 weeks
Duration of activity C = 7 weeks

Adding up the durations, we get:
ES for activity D = max (ES for activity B, ES for activity C) + duration of activity B = 12.67 weeks (since the ES for activity B = 8.67 weeks and the ES for activity C = 12.67 weeks)

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