Question: Timberwolves Electric and Wiring Company installs wiring and electrical fixtures in residential construction. Andrew Dickel, the owner of Timberwolves, has been concerned with the amount of time it takes to complete wiring jobs because some of his workers are very unreliable. For each wiring job, a list of activities, their mean duration times, standard deviation of duration times, and immediate predecessors are given in the following table:
Assume that all activity durations follow a normal distribution, with the means and standard deviations shown. Use simulation to determine the probability that Timberwolves will finish the project in 40 days or less.