Consider the oversimplified network given in Figure 11- 19, which might be only a portion of a larger network, a portion which is subject to considerable chance variation in the perfmmance times. In Figure 11-19, a and b are 5 and 95 percentiles, respectively.

a. Compute t, and V, for each of the four activities.

b. What is the earliest expected time of event 3?

c. What is the variance, V x, for the actual occurrence time for event 3?

d. What is the probability that the project will be completed by time 8? By time 9?

e. What time are you fairly sure ( say 95 percent confident) of meeting for the completion of the project, i.e., the occurrence of event 3?