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Let us suppose that the diameters at breast height (DBH)of a certain species of tree can be described by a Normalmodel with mean 239 mm

Let us suppose that the diameters at breast height (DBH)of a certain species of tree can be described by a Normalmodel with mean 239 mm and standard deviation 49 mm.

If 70% of the trees have diameters are between X and350mm, what is X?

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