Three recent university graduates have formed a partnership and have opened an advertising firm. Their first project consists of activities listed in the following table.
a. Draw the precedence network.
b. What is the probability that the project can be completed in 24 days or less? In 21 days or less?
c. Suppose that now is the end of the seventh day and that activities a and b have been completed while activity d is 50 percent completed. Three-point estimates for the remaining duration of activity d are now 5,6, and 7 days. Activities c and h are ready to begin. Determine tire probability of finishing the project by the end of (a) day 24 and (b) day 21.

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Duration in Days Activity Precedes Optimistic Most Likely Pessimistic 7 12 15 End 5 End 4 4 End