Copper Core, LLC manufactures and installs custom wire harnesses in commercial aircraft.

Susie, the project manager, 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. To solve this

problem, calculate the expected completion time and variance for each activity, draw a

network diagram, complete a forward and backward pass, identify the critical path. Follow the

step$-$by$-$step solution approach in Gido and Clements text, Chapter $5,$ Appendix $1$ called

Probabilistic Activity durations. What is the probability that AeroRich will finish the project in

$40$ days or less?

Due to rounding, between $\mathrm{.}611$ and $\mathrm{.}622$

Due to rounding, between $\mathrm{.}940$ and $\mathrm{.}949$

Due to rounding, between $\mathrm{.}968$ and $\mathrm{.}982$

Due to rounding, betwenn $\mathrm{.}850$ and $\mathrm{.}859$