Question 3 [30 Marks) 3.1 To complete the wing assembly for an experimental aircraft, James has laid out soven major activities involved. These activities are labelled A through in the following tablo, which also shows the estimated completion time (in weeks) and immediate predecessors ACTIVITY immediate predecessor b A B 1 2 4 8 2 4 1 2. 3 5 9 5 5 2 3 4 6 10 8 6 3 A B CD E F G E (10marks) Determine the expected time and variance for each activity