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B5. (a) HKU engineering manager knows the succession of the project activities and the optimistic, most likely and pessimistic time (in week) for the series of related activities and are listed in the following table: Activity Predecessor(s) Optimistic Most likely Pessimistic a (weeks) m (weeks) b (weeks) A 5 6 7 B 6 8 10 3 4 5 D A,B 5 9 12 E 8 9 10 F E 9 10 11 G DE 6 7 9 H F 8 10 13 I G 12 13 14 J A 3 6 9 K HI 5 7 8 L JK 3 4 8 (1) Use PERT, draw the critical path and label Early Start (ES), Early Finish (EF), Late Start (LS) and Late Finish (LF) time like the below Figure QB5; (i) Identify the critical path and the expected duration of the project; (iii) Determine the probability that the project will be finished beyond 3 % of the expected duration ES EF Activity LS LF Figure QB5 a +4m + b Some useful equations: V=52 6) State the technology life cycle and locate virtual reality (VR) in the cycle. Discuss and suggest ways to integrate VR in engineering teaching and learning