QUESTION 12 An activity on a PERT network has these time estimates: optimistic - 2, most likely - 4, and pessimistic - 6. What is its expected activity time and variance? 3.67; 1 4.33; 1 3.33; 0.44 4; 0.44 QUESTION 3 Two critical path activities are candidates for crashing on a CPM network. Activity details are in the table below. To cut two days from the project's duration, activity. should be crashed first, adding to project cost and activity should be crashed second, adding to project cost. Crash Cost $6,800 9 days $5,000 Activity Normal Time Normal Cost Crash Time A 8 days $6,000 6 days B 10 days $4,000 A: $400 and then A: $400 A: $400 and then B; $1000 B; $1000 and then A $400 B; $1000 and then B; $1000