problem 3 A, B, C D

problem 4 A,B,C,D,E

Problem 3 Building a backyard swimming pool consists of nine major activities. The activities, their immediate predecessors, and time estimates (in days) are given in the following table: a. Calculate the expected durations and the variance (or standard deviation) for each activity. b. What is the expected project completion time and the project standard deviation? c. What is the likelihood the project will be finished in 26 or fewer days? d. If you wanted to be 99% confident of completing the swimming pool on time, what should be the delivery time? Problem 4 The following table provides the activities that must be accomplished to complete a project with time and cost estimates: a. Construct the project's network. b. Under normal time, what are the project's duration; project total cost; and the critical path? c. Calculate the crashing cost per week for each activity. d. If the goal is to complete the project in 10 days, which activities should we crash and by how much? Show all the steps. e. What is the minimum total cost for the 10-day completion time