Using the data in the table, calculate the expected time (ET) and variance for each activity.

Job # Predecessor Job(s) a m b Expected time Variance

a ----- 7 8 9

b A 4 5 6

c A 2 3 4

d B, C 3 4 11

e C 3 4 5

f D, E 1 3 5

A. Using the data in the table, calculate the expected time (ET) and variance for each activity.

c. List each unique path through the network. For example, "A, B, C" would indicate a path consisting of activity A, followed by activity B, which is followed by activity C.

d. Indicate the critical path. (You can do this by inspecting the paths -- you do not have to calculate ES, EF, LS, LF.) What is the expected completion time for the project?

e. What is the probability that the project will be completed in 22 days or less?

f. What is the probability that the project will take more than 22 days to complete?