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A mining company wants to estimate the average daily tonnage of ore that they mine. The company know that each day they can mine between

A mining company wants to estimate the average daily tonnage of ore that they mine. The company know that each day they can mine between 100 and 700 tons of ore. The company wants to be within 45 tons of the actual daily average. How many days should the company sample to be 95% confident of the result?

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