The estimated times and immediate predecessors for the activities in a project at Howard Umrah's retinal scanning company are given in the following table. Assume that the activity times are independe Time (weeks) Time (weeks) Immediate Immediate Predecessor(s) m m b Predecessor(s) Activity A Activity a с 7 10 11 9 9 11 B 4 10 18 D 6 10 12 B This exercise contains only parts a, b, c, d, and e. 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) Activity Expected Time Variance a b
