optimistic completion time, the most likely completion time, and the pessimistic completion time $($all in days$)$ for new contract are given in the following table:

$\backslash$table$[[$Activity$,$Time $($days$),\backslash$table$[[$Immediate$],[$Predecessor$($s$)]]],[a,m,$b$],[\frac{?}{\text{b}\text{a}\text{r}}(A),2,5,8,1],[$B$,4,5,6,-],[$C$,1,2,3,-],[$D$,6,7,8,$C$],[$E$,3,5,7,$B$,$ D$],[$F$,2,3,a_4,$A$,$ E$],[$G$,5,9,14,$A$,$ E$],[H,11,12,13,F$