Question Two (25 marks) a) Explain the main types of float in network analysis (6 marks) b) State the common errors in network drawing (3 marks) c) Consider the following project with the following activities and their respective duration in days Activity Activity time Optimistic Most likely Pessimistic 11-2 3 6 15 1-5 1 2 9 2-6 2 3 10 3-5 0 0 0 5-7 10 15 50 1 7.5 11-3 .5 1. .5 12-4 .5 3 11 13-4 1 10 32 4-7 6 25 6-7 3 5 d) Required i. Draw the network diagram (6 marks) Determine the critical path (2 marks) iii. Determine the project duration (3 marks) e) Explain the key assumptions of CPM/PERT