predecessors, and the activity time estimates (in weeks) are listed in the following table. (a) Draw a project network (b) Develop an activity schedule. (Round your answers to two decimal places.) (c) What are the critical activities? (Enter your answers as a comma-separated list.) What is the expected project completion time (in weeks)? (Round your answer to two decimal places.) weeks Should the athletic director begin planning the track and field team before January 1 ? (The probability for finishing on schedule should be at least 0.9 .) Since the probability that the track and field team will be ready by April 1 is than 0.9 , the athletic director begin planning before January 1