Marty and Marge are renovating their house. They hope for all work to be completed before the Thanksgiving holiday, which is 55 days away. Given the data below, what is the probability that the house will be completed before Thanksgiving? Assume that only one activity can be done at a time. How many days would Marty and Marge need to crash the project (reducing the expected duration) in order to achieve at least a 90 percent probability of completing the renovation before Thanksgiving? Assume that crashing the project does not affect the uncertainty associated with activities.

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Activity Demolition Framing Plumbing Wiring Drywalling Painting and Finish Best-Case Duration 1 day 5 days 5 days 13 days 4 days 2 days Most Likely Case Duration 2 days 8 days 10 days 20 days 8 days 4 days Worst-Case Duration 3 days 15 days 15 days 25 days 15 days 8 days