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Under the normally spreading chestnut tree. A forester measured a sample of trees in a tract of land that is being sold for a lumber harvest. Among 27 trees, she found a mean diameter of 10.4 inches and a standard deviation of 4.7 inches. Suppose her sample gives an accurate representation of the entire tract of land and that the tree diameters follow a
- Sketch a graph of the distribution of tree diameters.
- What diameter would you expect the central 95% of trees to be?
- About what percentage of trees should be less than one inch in diameter?
- About what percentage of the trees should be between 10.4 and 19.8 inches in diameter?
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