7.
\begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{e02c4a9a-d2ab-489f-b838-9b4d902c4457-9_1042_1426_267_315}
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\caption{Figure 7}
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A project is modelled by the activity network shown in Figure 7. The activities are represented by the arcs. The number in brackets on each arc gives the time required, in hours, to complete the activity. The numbers in circles are the event numbers. Each activity requires one worker.
- Explain the significance of the dummy activity
- from event 4 to event 6 ,
- from event 5 to event 7
(3)
- Calculate the early time and the late time for each event. Write these in the boxes in the answer book.
- Calculate the total float on each of activities D and G. You must make the numbers you use in your calculations clear.
- Calculate a lower bound for the minimum number of workers required to complete the project in the minimum time.
- On the grid in your answer book, draw a cascade (Gantt) chart for this project.