$\backslash$table$[[$Activity$,$Description,Optimistic $($a$),$Most Probable $($m$),$Pessimistic $($b$)],[$A$,$Plan event,$2,3,4],[$B$,$Select location,$2\mathrm{.}5,2,6],[$C$,$Decide on speakers & vendors,$4,4,4],[$D$,$Prepare & mail brochures,$2,4,6],[$E$,$Update web site,$1\mathrm{.}5,2\mathrm{.}5,3\mathrm{.}5],[$F$,$Final check with speakers & vendors,$3\mathrm{.}5,4,4\mathrm{.}5],[$G$,$Registration & hotel reservations,$3,3,6],[$H$,$Finalize last$-$minute details,$2,5,5]]$

The Variance for Activity F is $($round it up to $2$ decimal places$)$