Ross Hopkins, president of Hopkins Hospitality, has developed the tasks, durations, and predecessor relationships in the following table for building new motels. Time (weeks) Immediate Predecessor(s) Activity Activity A B C D E F a Time (weeks) 6 1 8 5 1 5 m 9 9 12 7 3 8 b 10 24 16 9 4 20 A A A B C, E G H 1 J K a) The expected (estimated) time for activity C is 12 weeks. (Round your response to two decimal places.) b) The variance for activity C is weeks. (Round your response to two decimal places.) a 2 1 7 6 1 m 3 1 7 8 1 b 5 1 7 12 4 Immediate Predecessor(s) C, E F F D, G, H 1, J