A computer$-$system installation project consists of eight activities. The immediate predecessors and activity times in weeks are as follows:

$\backslash$table$[[$Activity$,$Immediate Predecessor,Activity Time$],[$A$,------,3],[$B$,------,6],[$C$,$A$,2],[$D$,$B$,$C$,5],[$E$,$D$,4],[$F$,$E$,3],[$G$,$B$,$C$,9],[$H$,$F$,$G$,3]]$

a$.$ Draw the network for this project.

b$.$ What are the critical$-$path activities?

c$.$ What is the project$-$completion time?

d$.$ As a project manager, where would you focus your attention given your analysis?

$2.$ McGee Carpet and Trim installs carpet in commercial offices. Andrea McGee has been very concerned with the amount of time it took to complete several recent jobs. Some of her workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and the pessimistic completion time $($all in days$)$ for a new contract are given in the following table:

$\backslash$table$[[$Activity$,$Time $($Days$),\backslash$table$[[$Immediate$],[$Predecessors$]]],[$a $($optimistic$),$m $($most likely$),b($pessimistic$)],[A,3,6,8,-],[$B$,2,4,4,-],[C,1,2,3,-],[D,6,7,8,C$