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In a manufacturing process, there are three stages. the average run-time for stage one is 5.6 minutes with a standard deviation of 1.2 minutes. The mean run-time for stage two is 12.3 minutes with a standard deviation of 3.8, and, for stage three, the mean is 6.4 minutes with a standard deviation of 2.8 minutes. What is the mean and standard deviation of the entire process

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