Table 4 shows the activities, predecessors and time estimates (in months) for a work package of the project.

Required:

1. Draw a network diagram (using the activity-on-node method) for the project.
2. Identify the critical path and calculate the expected duration to complete the project.
3. Calculate the probability of completing the project in 28 months.
4. Calculate the probability of completing the project in 24 months.