please solve and show work with all steps

The following diagram shows activities reyuired to complete the launching of new product. At the end of the project, the new product would be ready for launching. a) Calculate the missing expected times and missing variances b) Calculate the standard deviation of path EFG ? c) Calculate the probability that path AB would be completed before 17 days d) The probability of path C-D finishing within 17 days is 0.9969 and the probability of path E-F-G finishing within 17 days is 0.9906. What is the probability that the project would finish within 17 days? e) Assume that the network bccame deterministic with all the most likely times becoming the deterministic times, what is the early start of G. f) Assume a new activity (X) is added to the deterministic network (most likely times are deterministic times). Activity X precede the End node and follows activity D and G (i.e. D and G precede X ). Activity X has a duration of 8 days, and a Late Finish of 23 days. What is the slack of activity X? g) Draw the network representing the relationships below