d) Now assume that the duration of some activities is not known with certainty. The estimates of these activities are shown below. Assuming that the duration of the other activities remains unchanged. answer the following questions. Activity Variance Expected Time (Weeks) 6 A 0.5 B 5 0.4 C 7 1.5 E 4 0.75 G 10 2 i) Given this new information, what is the project's expected completion time and standard deviation? Show your work. (4 points) 11) Calculate the probability of completing the project in 21 weeks. (2 points)