Activity a m b Immediate Predecessor

$($

s

$)$

$$Activity a m b Immediate Predecessor

$($

s

$)$

A

$8$

$1$

$0$

$1$

$1$

$-$

$$C

$9$

$9$

$1$

$3$

$$A

B

$4$

$1$

$0$

$1$

$7$

$-$

$$D

$6$

$8$

$1$

$1$

$$B

$$c$)$ The variance of the critical path$=$ WEEKS