need help with both

12. The following table represents a plan for a project: Times (days) Predecessor Jobs) b 4 Job No 1 2 3 1 3 2 5 4 1 4 1 5 6 2. 3 4 5.6 2 1 4 3 1 1 1 2 2 3 5 3 2 8 3 12 11 5 3 9 6 12 5 8 7 8 4 9 4 7 4 10 11 9, 10 7 a. Construct the appropriate network diagram. b. Indicate the critical path. c. What is the expected completion time for the project? d. You can accomplish any one of the following at an additional cost of S1,500: (1) Reduce job 5 by two days. (2) Reduce job 3 by two days. (3) Reduce job 7 by two days. If you will save $1,000 for each day that the earliest completion time is reduced. which action, if any, would you choose? 4. What is the probability that the project will take more than 30 days to complete? 13. A construction project is broken down into the following 10 activities: Immediate Predecessor Time (weeks) 2 Activity 1 2 3 4 5 6 7 8 9 10 1 1 1 2.3 3 5 6 3 4 5 6,7 8.9 2 3 5 7 a. Draw the network diagram. b. Find the critical path. c. If activities 1 and 10 cannot be shortened, but activities 2 through 9 can be shortened to a minimum of one week each at a cost of $10,000 per week, which activities would you shorten to cut the project by four weeks