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

A research 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 Immedinte Predecessors Activity Activity Expected Variance Time (te) Actrivity Standard Deviation (0) Manpower Requirement A B c Estinate Activity Titnes Months b 4 8 SI 12 16 4 6 1 2 3 B 16 3 + 4 6 14 2 B) () (b AWO AB B D CE D F G d) ( Belles ele sellelele a ACT A3 ACTB=6 ACTC= 4 ACTD=4 ACTE=5 ACTF3 ACT G=3 ACTH=2 NO Table 1 Calculate the activity standard deviation (a) the activity "F" in the given table. 0.333 0.444 0.222 0.111