Time (weeks) b Time (weeks) Immediate Predecessor(s) a m a m b Activity A Activity Immediate Predecessor(s) A 9 8 10 12 12 16 10 10 11 11 B 6 D 5 B This exercise contains only parts a, b, c, and d. a) Based on the activity time estimates, the expected times and variance for each of the activities are (round your response to two decimal places): Expected Time Activity Variance A 10.17 0.25 B 11.67 2.78 9.83 0.25 D 9.33 1 b) The expected completion time of the project = 21 weeks (round your response to two decimal places). c) The project variance of completion time = weeks (round your response to two decimal places). (enter as a probability and d) If the time to complete the project is normally distributed, then the probability that the project will be finished in 21 weeks or less = round your response to two decimal places)