project management question on time scheduling

1) All required activities associated with the dependencies for a project are listed below in the table. Optimistic, pessimistic and most likely duration estimates for each activity are also in the table. Activity Preceding Duration Estimate Duration Estimate Duration Estimate Activity (Optimistic) - (Most Likely) - (Pessimistic) - (days) (days) (days) B 2 3 3 1 2 A B B + 3 days lag B C-2 days lead C,D,F G 4 3 6 4 3 Imo 6 3 6 11 6 4 24 6 3 4 G 4 8 2 H 2 a) Draw Project network diagram by using activity-on-node method. b) identify the critical path separately based on optimistic, pessimistic and most likely duration estimates and identify slacks. Did the critical paths change through scenarios? c) By using PERT, calculate the estimate for each activity and identify the critical path based on those estimations d) Assume that the project team finds out the estimation on activity E was wrong and the duration had to be two days longer that estimated. How is the project plan influenced by the change? (based on the calculations in part c) e) Assume that the project team finds a new technology which may help to remove the 3-day lag time between Activity Band Activity D. How is the duration of the project influenced by that technology? (based on the calculations in parte)