Please explain this problem step by step. Thanks.

6. (20 points) The table below lists the time estimates and immediate predecessor(a) for each activity in a product marketing project that is to be scheduled using CPM. Similar projects for other products have been accomplished in the past, so the activity times are fairly. certain. (a) (points) Draw the CPM network diagram for the project, labeling all activities and times. (b) (15 points) Perform a forward pass and backward pass through the network to determine the critical path, the expected duration of the project, and the slack time for activities 3 & 6. Activity 4 5 6 8 Activity time (days) Immediate predecessor 3,4 5,6 ANSWERS: Critical Path = Duration = Slack times 3=(.6=( 2 3 7 4 3 7 5 2 6 9 2 4