2.
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\caption{Figure 1}
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A project is modelled by the activity network shown in Figure 1. The activities are represented by the arcs. The number in brackets on each arc gives the time required, in hours, to complete the corresponding activity. The numbers in circles are the event numbers. Each activity requires one worker, and the project is to be completed in the shortest possible time.
- Explain the significance of the dummy activity from event 3 to event 4
- Complete Diagram 1 in the answer book to show the early event times and the late event times.
- State the critical activities.
- Calculate a lower bound for the number of workers needed to complete the project in the minimum time. You must show your working.
- Draw a Gantt chart for this project on Grid 1 in the answer book.