Activity Description Immedinte Predecessor Activity Time: 1 (in days) 2 B A 6 B D B 12 E B 20 F Plant specifications study environmental impact study Engineering study Demolition, remodeling, and dust control Enter additional electrical machines and equipment Job-site security On site execution of the building extension On site execution of the machinery implementation Testing the new building with machines onboard security control and safety monitoring 16 B,C D.E G 25 H F 35 I F 20 J GHI 25 Part II: Risk Assessment In order to evaluate the possible risk impact on the project completion, you have conducted a research (using the four risk events you already listed in part 1) that have led to the following results: If one risk event occurs during any activity then it will delay the activity buy 3 days. Hence, and in order to apply the PERT technique, you will define three time estimates 23 following: To: The activity time: 1 (from the table) Tm: T + Delay from the occurrence of two risk events Tp: T + Delay from the occurrence of four risk events Questions: 1. Draw the project AON diagram and compute the three time estimates for each activity. 2. What is the expected time of each activity? 3. What are the activities on the critical path? 4. What is the variance of the time for each activity? 5. What is the probability that the project will finish at or before a period equal to 90% of the project expected duration? 6. What is the probability that the project will finish at or before a period equal to 95% of the project expected duration