estion 2 A partially solved PERT problem is detailed in the table below. Times are given in weeks. yet answered ked out of 12.00 Hag question Activity Immediate Predecessor(s) Optimistic Most Likely Pessimistic 8 10 15 B 7 8 05 5 6 10 D 3 3 3 E BD 1 5 9 F B.D 4 7 10 G 3 8 10 I H E 5 7 9 4 5 5 8 8 10 15 B 7 8 8 9 A 5 6 10 D A 3 3 3 E B.D 1 5 9 F BD 4 7 10 G 3 8 10 E 5 7 9 1 E 4 5. 00 J F 2. 5 8 K HI 1 3 3 6 a) Calculate the expected duration (D), and variance of each activity, b) Calculate ES, EF LS, LES for each activity Activity ET Variance ES EF LS LF s B 3 b) Calculate ES, EF, LS, LF, S for each activity Activity ET Variance ES EF LS LF S A B E F G H K SOM ENG