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Kelle Carpet and Trim installs carpet in commercial offices. Peter Kelle has been very concerned with the amount of time it took to complete several tecent jobs. Sorne of his workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion fime, and the pessimistio completion time (all in days) for a new contract are given in the following table: This exercise contains only parts b,c, and d b) Activities on the critical path for the project are