please use excel for a-d

3.14 McGee Carpet and Trim installs carpet in commercial offices. Andrea McGee has been very concerned with the amount of time it took to complete several recent jobs. Some of her workers are very unreliable. A list of activities and their optimistic comple- tion time, the most likely completion time, and the pessimistic com- pletion time (all in days) for a new contract are given in the following table: Time (days) Immediate Predecessor(s) m2 b Activity A B D E F G H 1 J K NoW-ana-NWA 6 on a an AWNA 10 2 6 11 16 8 8 4. 3 8 6 14 4 9 12 20 10 C BD A, E A, E F G H1 10 14 2 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) Dctermine ES, EF, LS, LF, and stack for each activity. d) What is the probability that McGee Carpet and Trim will finish the project in 40 days or less