23 A more careful analysis of time estimates for the space module assembly of the preceding exercise is given in Table 20. Note that the “most likely estimates” are identical to the

“time estimates” in Exercise 22.

TABLE 20 Time estimate (weeks)
Activity Optimistic Most likely Pessimistic A 25 30 45 B 10 15 20 C 20 25 35 D 3 3 5 E 5 7 12 F 1 1 1 G 4 5 7 H 2 2 3 I 4 4 6 J 8 10 14 K 6 8 15

a. Relabel your network in Exercise 22 to include (in place of ) and Use Eqs. (1)
and (2).

b. Compare total slacks and free slacks to Exercise 22.

c. Has the critical path changed?

d. Determine the following probabilities:
1. That the project will be completed in 54 days or less 2. That the project will be completed by the date obtained from the critical path calculations using as the activity durations 3. That the project takes more than 70 days to complete