Question: 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

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?

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