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The mill wants to know how many plants it must sample to know if the wood density of shagbark hickory trees in the area is

The mill wants to know how many plants it must sample to know if the wood density of shagbark hickory trees in the area is above the mean of 0.8 g/cm3 by +0.4 g/cm3; you may assume that the standard deviation is 0.70 g/cm3. Use =0.05 and 1-=0.85 (or power=85%) in your calculations.

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