Problems 443 15. Doug Casey is in charge of planning and coordinating next spring's sales management training program for his company. Doug listed the following activity information for this project: Time (weeks) Immediate Activity Description Predecessor Optimistic Most Probable Pessimistic ABCDERGHL А Plan topic 1.5 2.0 2.5 Obtain speakers A 2.0 2.5 6.0 List meeting locations 1.0 2.0 3.0 Select location C 1.5 2.0 2.5 Finalize speaker travel plans B. D 0.5 1.0 1.5 F Make final check with speakers E 1.0 2.0 3.0 Prepare and mail brochure B.D 3.0 3.5 7.0 Н Take reservations G 3.0 4.0 5.0 Handle last-minute details F. H 1.5 2.0 2.5 a. Draw a project network. b. Prepare an activity schedule. c. What are the critical activities and what is the expected project completion time? d. If Doug wants a 0.99 probability of completing the project on time, how far ahead of the scheduled meeting date should he begin working on the project?