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

exercise contains only parts $b,c,$ and $d.$

ctivities on the critical path for the project are