b:

The variance for activity C is

Answer c:

The network diagram is

Ross Hopkins, president of Hopkins Hospitality, has developed the tasks, durations, and predecessor relationships in the following table for building new motels. Time (weeks) Time (weeks) b Immediate Predecessor(s) a m a m b Activity A Activity G 4 8 2 3 4 B A 2 9 1 7 1 7 12 23 18 10 4 20 8 12 6 3 8 Immediate Predecessor(s) C, E F F D, G, H 1, J 1 7 14 4 J 4 D E F 7 5 1 A A B C, E K 1 1 5 a) The expected (estimated) time for activity C is weeks. (Round your response to two decimal places.)