Problem 12-09 (Algorithmic) A project has four activities (A, B, C, and D) that must be performed sequentially. The probability distributions for the time required to complete each of the activities are as follows: Activity Time Activity (weeks) Probability A 4 0.29 5 0.39 6 0.29 7 0.03 B D 27= 8 0.15 10 0.52 12 0.33 0.09 9 0.22 11 0.42 13 0.20 15 0.07 11 0.60 13 0.40