To complete the wing assembly for an experimental aircraft, Jim Gilbert has laid out the seven major activities involved. These activities have been labeled A through G in the following table, which also shows their estimated completion times (in weeks) and immediate predecessors. Determine the expected time and variance for each activity.

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ACTIVITY a m b IMMEDIATE PREDECESSORS A 1 2 3 B 2 3 4 - C 4 5 6 A D 8 9 10 B E 2 5 8 C, D F 4 LO 5 6 D G 1 2 3 E