Question: 12-15. In an industrial setting, process steam has been found to be normally distributed with an average value of 25,000 pounds per hour. There is

12-15. In an industrial setting, process steam has been found to be normally distributed with an average value of 25,000 pounds per hour. There is an 80% probability that steam flow lies between 20,000 and 30,000 pounds per hour. What is the variance of the steam flow? (12.5)

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