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. Activity A B a Time (weeks) 8 6 m 10 12 b 11 18 Immediate Predecessor(s) Activity A Activity C D BCD Expected Time a b) The expected completion time of the critical path = weeks (round your response to two decimal places). 7 6 Time (weeks) m 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): 9 9 Variance Immediate b Predecessor(s) A B 13 11

(b) the expected completion time of the critical path?

(c) the variance of the critical path

(d) if the time to complete the activites on the path is normally distributed, then the probabilites thet the critical path will be finished in 21 weeks

(e) if the time to complete the activites on the non critical path is normally distributed, then the probabilites thet the critical path will be finished in 21 weeks

This exercise contains only parts a, b, c, d, and o a) Based on the activity time estimates, the expected treses and varianoe for each of the activites are (round your response to two docimefolaces) b) The eupected completion lime of the critical path - Wocks fround your cosponse to fwo docimar places