Part $2$: Using the table below, calculate the expected time for activity and the variance of estimated time for activity for activities A$-$B$.$

$\backslash$table$[[$Activity$,\backslash$table$[[$Optimistic$],[$Time$]],\backslash$table$[[$Most$],[$Likely$],[$Time$]],\backslash$table$[[$Pessimistic$],[$Time$]],\backslash$table$[[$Expected$],[$Time$]],{}^2$