Roger Ginde is developing a program in supply chain management certification for managers. Ginde has listed a number of activities that must be completed before a training program of this nature could be conducted. The activities, immediate predecessors, and times appear in the accompanying table: Activity Immediate Predecessor(s) Time (days) B O OWO B AD EF 10 6 2 2 5 5 8 GRUNN F G This exercise contains only parts b, c, and d. b) The critical activities for the leadership training program development project are B-D-E-G A.E.G C-F-G Kelle Carpet and Trim installs carpet in commercial offices, Peter Kelle has been very concerned with the amount of time it took to complete several recent jobs. Some of his workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and the pessimistio completion time (all in days) for a new contract are given in the following table: Activity A Immediate Predecessor(s) X-IOMO > C D E F G H Time (days) a m b 4 7 8 4 5 6 2 3 4 7 8 2 4 6 1 2. 3 6 11 14 10 11 12 5 7 14 16 18 4 8 12 E9 Byt9UP LITO LOUI BD A, E . J HI This exercise contains only part a a) Based on the activity time estimates, the expected times and variance for each of the activities are: (Round your responses to two decimal places) Activity Expected Time Variance