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

C

D

b) The expected completion time of the critical path =

The expected completion time of the path other than the critical path =

c) The variance of the critical path =

The variance of the path other than the critical path =

d) If the time to complete the activities on the critical path is normally distributed, then the probability that the critical path will be finished in

21

weeks or less =

e) If the time to complete the activities on the non critical path is normally distributed, then the probability that the non critical path will be finished in

21

weeks or less =

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 independent. Immediate Predecessor(s) Activity A B Time (weeks) a m b 9 10 13 5 10 18 Activity Time (weeks) a m b 9 9 12 6 8 14 Immediate Predecessor(s) A B D 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): Expected Time Activity Variance