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After completing a PERT/CPM analysis of a construction project with uncertain activity times, project researchers have determined that the expected value of the total time

After completing a PERT/CPM analysis of a construction project with uncertain activity times, project researchers have determined that the expected value of the total time to complete the project is 39 weeks with a standard deviation of 3 weeks. Assuming that project completion time follows a normal distribution, what is the probability that the project will be completed in a 41- week deadline?

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