Proportion of the trees, The diameters of Douglas firs grown at a Christmas tree farm, Basic Statistics

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Proportion of the trees

The diameters of Douglas firs grown at a Christmas tree farm are normally distributed with a mean of 4 inches and a standard deviation of 1.5 inches.

a) what proportion of the trees will have diameters between 3 and 5 inches?

b) what proportion of trees will have diameters less than 3 inches?

c) Your Christmas tree stand will expand to a diameter of 6 inches. What proportion of the trees will not fit in your Christmas tree stand?

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Basic Statistics: Proportion of the trees

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Basic Statistics: Proportion of the trees

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