Can someone help me with the first problem. Thank you

Dr. Ell has been given a budget of $10,000 to organize a conference at her university in 3 months' time (13 weeks) via an educational grant. She has a team of 2 research assistants and after some deliberation, they identified the following activities that are required to be completed for hosting a successful conference. Immediate Predecessor Activity A B -- Description Planning Topics and Sessions Identifying potential venues in the city Selecting a venue for the conference Inviting presenters from various universities Finalizing presenters for each session Completing registration for all presenters Last minute edits, replacements, and lists B AC D E D F E G F Dr. Ell has approached you, her student, to help her figure this out, as a part of her Management Science class assignment. Please give your responses, with appropriate explanations, tables, and formulas, where relevant, to the following questions: 1. Follow a PERT/CPM model to identify the project network, activity schedule, critical activities, and the expected time for completing the project successfully. The expected completion times for each of the listed activities is based on the experiences of all the people on the team and is as follows: Activity Optimistic Most Probable Pessimistic A 1 2 B 1 2 3 1 3 5 1 2 3 - 6 NW NN P NN 1 1 1 1