Can I recieve help with this? I submitted it in previously and the answer was wrong.

2. The director of continuing education at Ichabod University just approved the planning for a sales training seminar. Her administrative assistant identified the various activities that must be done and their relationships to each other, as shown below: Immediate Most Predecessor(s) Optimistic Likely Pessimistic 5 7 8 6 8 12 5 3 4 11 17 25 Activity Description Design brochure and course A announcement B Identify prospective teachers C Prepare detailed outline of course D Send brochure and applications E Send teacher applications F Select teacher for course G Accept students H Select text for course 1 Order and receive texts Prepare room for class B 8 10 12 5 3 4 CE D 4 8 9 5 7 9 F G H 8 11 17 G 4 4 4 a. b. Calculate the expected time and variance for each activity Draw the AON network diagram (with ES, EF, LS, LF, and Slack time) The director wants to conduct the seminar 46 working days from now. What is the probability that everything will be ready in time? C