Zuckerman Wiring and Electric is a company that installs wiring and electrical fixtures in residential construction. John Zuckerman has been concerned with the amount of time that it takes to complete wiring jobs. Some of his workers are very unreliable. A list of activities and their optimistic, their pessimistic and their most likely completion times in days are given in the following table:

Determine the expected completion time and variance for eachactivity.

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DAYS IMMEDIATE ACTIVITY a mb PREDECESSORS 1 2 |3 0 246 B, D A, E A, E 10 | 14 1 2 4 10 11 12 14 16 20 28 10 H, I