Use the network diagram and the table to answer the following questions:

$\backslash$table$[[$ACTIVITY$,$OPTIMISTIC,$\backslash$table$[[$MOST$],[$LIKELY$]],$PESSIMISTIC,$\backslash$table$[[$EXPECTED$],[$TIME$]],$VARIANCE$],[$A$,$N$/$A$,$N$/$A$,$N$/$A$,2,0\mathrm{.}2],[$B$,$N$/$A$,$N$/$A$,$N$/$A$,3,0\mathrm{.}8],[$C$,$N$/$A$,$N$/$A$,$N$/$A$,5,0\mathrm{.}7],[$D$,$N$/$A$,$N$/$A$,$N$/$A$,4,1\mathrm{.}2],[$E$,$N$/$A$,$N$/$A$,$N$/$A$,2,0\mathrm{.}6],[$F$,3,4\mathrm{.}5,9,,],[$G$,$N$/$A$,$N$/$A$,$N$/$A$,4,1],[$H$,1,2,3,,],[$I$,$NA$,$N$/$A$,$N$/$A$,14,2]]$

a$.$ What are the expected durations and variances of activities $F$ and $H?$

b$.$ What are the critical activities?

c$.$ What is the expected project completion time?

d$.$ What is the variance of project completion time?

e$.$ What is the probability that this project can be complete in fewer than $25$ days?