A company interested in lumbering rights for a certain tract of slash pine trees is told that

Question:

A company interested in lumbering rights for a certain tract of slash pine trees is told that the mean diameter of these trees is 14 inches with a standard deviation of 2.8 inches.
Assume the of diameters is roughly mound-shaped.
a. What fraction of the trees will have diameters between 8.4 and 22.4 inches?
b. What fraction of the trees will have diameters greater than 16.8 inches? Distribution
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