(a) A network consists of the following list. Times are given in weeks. (20 marks) Activity Preceding Optimistic Probable Pessimistic A -- 5 11 14 B -- 3 3 9 C -- 6 10 14 D A, B 3 5 7 E B 4 6 11 F C 6 8 13 G D, E 2 4 6 H F 3 3 9 (i) Draw the network diagram. (7 marks) (ii) Calculate the expected duration and variance of each activity. (4 marks) (iii) Calculate the expected duration and variance of the critical path. (4 marks) (iv) What is the general purpose of a scheduling specification? (5 marks)

(b) What can the project manager receive from an appropriate graphical display (such as a gantt chart) and project graphic representation of the project schedule?