A partially solved PERT problem is detailed in the table below. Times are given in weeks.

$\backslash$table$[[$Activity$,$Preceding,Optimistic,Probable,Pessimistic,Expected,Variance$],[,,$Time,Time,Time,Time,$],[$A$,-,7,9,14,,],[$B$,$A$,2,2,8,,],[$C$,$A$,8,12,16,,],[$D$,-,3,5,10,,],[$E$,$C$,4,6,8,,],[$F$,$B$,6,8,10,,],[$G$,F,2,3,4,,],[H,$D$,$ E$,2,2,8,,],[1,$G$,6,8,16,,]]$