please help me with this. i am new student. will give likes. please. thank you. with solution if possible

Aresearch project is scheduled for implementation based on the network shown. The estimated activity times and manpower required for the research project is as indicated in Table 1. Activity Immediate Predecessors Activity Activity Expected Variance Time (te) o Activity Standard Deviation Manpower Requirement A B D E F G H Estimate Activity Times (Months) b 4 8 12 8 12 16 4 6 8 1 2 3 6 8 16 2 3 4 4 6 14 5 8 AB B D CE D EG Seleeeegel ace gece ele scle cele ACT A = 3 ACT B = 6 ACT C=4 ACT D=4 ACTE=5 ACTF=3 ACT G=3 ACTH = 2 ( Table 1 Calculate the activity variance (02) the activity "B" in the given table. (b) 0.444 1333 1.778 1667