Question: #3a. For activity A3 we had a consensus that the shortest time to complete was 60 hours. The longest time (hopefully the disaster case) would

#3a. For activity A3 we had a consensus that the shortest time to complete was 60 hours. The longest time (hopefully the disaster case) would be 125 hours. And the most likely would be 87 hours. The network figure showed that the expected time or "average" for A3 is 88.83 = 88.8 hours (rounded). #3a. (70 points) Why isn't the average or the mean or expected time 60 hours + 125 hours + 87 hours = 272 hours Divide by 3 272 hours/3 = 90.67 hours = 90.7 hours (rounded)

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