Use both the longest path method and the ES$/$EF; LS$/$LF method for questions $($c$),($d$)$ and e

$($c$)$ What is the expected project completion time?

$($d$)$ What are the critical activities?

$($e$)$ What are the slack values for non$-$critical activities?

$($f$)$ What is the probability that the project will be completed in $39$ weeks?

$($g$)$ What is the probability that the project will be completed in $41$ weeks?