D Question 9 1.5 pts Use this information to answer the following questions. Consider the following Activity-On-Node (AON) PERT project. The three values that represent each activity's completion time (in days) correspond to an optimistic time, most likely time, and pessimistic time, respectively. 4-5-6 2-3-4 B D 3-4-5 4-5-6 F 5-6-7 3-4-5 E Refer to the figure. What is the probability of completing the project within 18 days? O 0.0668 O 0.4332 O 0.9332 O 0.4878 O 0.0122