3. Below is an AOA diagram that includes the optimistic, most likely, and pessimistic time estimates (in days) for each activity. However, we just found out that a mistake was made and that activity 4-6 should have the following values associated with it: 1-6-16. Use this information and the diagram to answer the question below. 7-8-10 4-5-6 3-5-9 6 7-8-11 1-4-6 3 5 2-3-4 A. What is the expected duration of the project? Be sure you use the following weighting: To +41, + Ip 6 B. Calculate the variance of the critical path. C. Calculate the standard deviation of the critical path