Can you solve the question by showing a, b, c, d and graphics one by one?

7. Jean Walker is making plans for spring break and has identified the activities that are necessary to prepare for her trip. a) Draw the network for this project. b) Find the critical path. Find the project completion time. c) Find the probability of finishing the project in less than 15 days (P(Z 19) =?). Activity Time estimates (days) Immediate Predecessor a m b A 1 3 5 B 2 7 12 3 4 5 A D 1 2 3 B E 2 5 C,D F 4 6 A G 2 3 4 E,F