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suppose a compnay has a prject that need 140 people to finsih sequentially. Each person's time spent on their task Ti is a uniformly distributed

suppose a compnay has a prject that need 140 people to finsih sequentially. Each person's time spent on their task Ti is a uniformly distributed random variable between [4,16] hours. Let's assume Ti's are mutually independent. Let X be the total time for the project to finish. Find the probability that X is less than 1376, assuming it is a normal distribution

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