The table given below shows the precedence relations, and three time estimates (optimistic, most likely, and pessimstic) of activities of a project. Write down the mean and standard deviation of the project completion time. Time (weeks) Activity Immediate Predecessor(s) optimistic most likely pessimistic A 1 2 3 B A 2 3 4 A 2 4 12 D B, C 2 3 10 E B 4 5 6 F D 1 3 5 G E 1 2 3 H 2 3 4 | |||T OLUI