The Figure below shows the arrangement of a group of activities associated with a new project. The symbols have their usual meanings. B L=3 SD-0.83 T.= 16 T.=24 SD-0.77 SD-0.39 D E F T.=5 T.= 19 T.= 20 SD-0 SD=0.5 SD-0.39 G H T.= 10 T.=14 T.=11 SD-0.55 SD-0.6 SD-033 Why can the standard deviations of paths DBC, DEF, DGHI be considered independant? OThe standard deviation of the common task is zero The overlaps between tasks are minimal and well managed 56%

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