Problem 6: For the project depicted in the activity-on-arrow diagram below [time units are days]: a] What is the critical path? b] How long will it take to complete the project? c] What is the late start time for task B? d] What is the slack for task B? e] What is the early start time for task C? i] What is the slack for task C? g] What is the late nish time for task G? h} What is the slack for task G? Problem '7: A task has an optimistic completion time of 8 days, a most likely completion time of 11 days, and a pessimistic completion time of 20 days. a] What is the expected completion time? b] What is the variance of the task's completion time? Problem 8: A task has an optimistic completion time of 6 days, a most likely completion time of 9 days, and a pessimistic completion time of 12 days. a] What is the expected completion time? b] What is the variance of the task's completion time? Problem 9: A project's critical path has ve tasks (A through E] with expected durations and standard deviations as given below. a] What is the critical path's expected length? b] What is the standard deviation of the critical path's length? Expected duration [clays] Std. Dev. [clays]