I've checked my question.

In the following table, task durations are given in

weeks. The estimates were made at the

$9$

$5$

$$percent

level

$($

see Section

$5$

$.$

$2$

$,$

$$Calculating Probabilistic

Activity Times subsection

$)$

$.$

Activity Predec. Opt. Normal Pess.

a

$$

$2$

$4$

$6$

b

$$

$3$

$5$

$9$

c a

$4$

$5$

$7$

d a

$4$

$6$

$1$

$0$

e b

$,$

$$c

$4$

$5$

$7$

f d

$3$

$4$

$8$

g e

$3$

$5$

$8$

$($

a

$)$

$$Find the expected time and variance for each task.

$($

b

$)$

$$Draw the network

$($

either AOA or AON

$)$

$$and

find the path with the longest expected time.

What is the expected time to complete this path?