Please give me the final answer for (a/b/c/d)

McGee Carpet and Tim install carpet in commercial offices. Andrea McGee has been very concerned with the amount of time it looks to complete several recent jobs. Some of her workers are very unreliable. A list of activities and their expected tomes all in days for the new contract are given below. 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 the ES, EF, LS, LF, and slack time for each activity. d) What is the probability that McGee Carpet and Tim will finish the project in 40 days or less