solve it with hand solution

Activity list for the Reliable Construction Co. Project Immediate Predecessors optimistic time 1 most likely pessimistic time time 2. 3 3,5 8 9 18 2 B 6 4 5,5 10 1 4,5 5 Activity Activity Description Excavate B Lay the foundation C Put up the rough wall D Put up the roof Install the exterior E plumbing Install the interior F plumbing G Put up the exterior siding H Do the exterior painting 1 Do the electrical work J Put up the wallboard K Install the flooring L Do the interior painting M Install the exterior fixtures E 4 4 10 D 5 11 6,5 8 E, G 5 17 3 9 7,5 9 F1 3 9 J 4 4 4 J 1 7 5,5 2 1 3 N Install the interior fixtures KL 5 5,5 9 a. draw the network diagram b. find the minimum completion time of project by using the expected times of activities c. find the variance of the project d. find critical path activities e. what is the probability to complete the project in 35 weeks