ACTIVITY a b IMMEDIATE PREDECESSOR(S) A 3 6 8 B 2 4 4 3 1 6 2 7 D 8 E 2 4 6 14 F G 6 1 10 2 B,D A,E A,E F 4 H 3 6 9 - 10 12 G 11 16 J 14 20 C HE K 2 8 10 a) Determine the expected completion time and variance for each activity. b) Determine the total project completion time and the critical path for the project. c) Determine ES, EF, LS, LF, and slack for each activity. d) What is the probability that the IE and his colleagues will finish the COVID-19 project in 40 days or less