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Given the following activity network: Activity A 1 takes 5 weeks, A 2 takes 7 weeks, aird A 3 takes 3 weeks with a 5

Given the following activity network:
Activity A1 takes 5 weeks, A2 takes 7 weeks, aird A3 takes 3 weeks with a 50% probability and 9 weeks with a 50% probability. What is the expected project completion time?
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