Trees part ii later on the forester in exercise 29 shows, Ask an Expert

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Trees, part II. Later on, the forester in Exercise 29 shows you a histogram of the tree diameters he used in analyzing the woods that was for sale. Do you think he was justified in using a Normal model? Explain, citing some specific concerns.

Exercise 29

Trees. A forester measured 27 of the trees in a large woods that is up for sale. He found a mean diameter of 10.4 inches and a standard deviation of 4.7 inches. Suppose that these trees provide an accurate description of the whole forest and that a Normal model applies.

a) Draw the Normal model for tree diameters.

b) What size would you expect the central 95% of all trees to be?

c) About what percent of the trees should be less than an inch in diameter?

d) About what percent of the trees should be between 5.7 and 10.4 inches in diameter?

e) About what percent of the trees should be over 15 inches in diameter?

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Category:- Computer Engineering
Reference No.:- M92189168

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