A small software development project has eight major activities. The times are estimated and provided in the table $1-2$ below. All times are in weeks. Answer Question # $6$ to $10$:

$\backslash$table$[[$Activity$,$Optimistic,Most,Pessimistic,Immediate$],[,$Time,Likely Time,Time,Predecessor$($s$)],[$A$,3,4,5,--],[$B$,5,7,9,--],[$C$,2,3,10,$A$],[$D$,2,5,8,$B$],[$E$,1,7,7,$B$],[$F$,3,5,7,$C$,$ D$],[$G$,7,8,9,$D$,$ E$],[$H$,2,6,10,$F$]]$