Extracted text: Draw and analyse the arrow network for the following activities by using PERT method assuming three estimated duration for each activity which are shown I the table below. Then, find: 1. The probability of completing the work of the whole project in 20 weeks 2. The completion time of the project at probability of 95% 3. The completion time of the project at probability of 100% Estimated duration (weeks) Activities Followed by to tm tp 8. A 4 6. B.G В 4 6 8 D,E 1 3 G E 5 7 F F 1/2 1 3/2 H,K G 3. 8. 7 1/2 1 3/2 1 7. 3 4. 11 K 1 3