26. Timber Tracts To estimate the amount of lumber in a tract of timber, an owner randomly selected seventy 15-by-15-meter squares, and counted the number of trees with diameters exceeding 1 meter in each square. The data are listed here:

a. Construct a relative frequency histogram to describe the data.

b. Calculate the sample mean x as an estimate of m, the mean number of trees for all 15-by-15-meter squares in the tract.

c. Calculate s for the data. Construct the intervals x 6s, x 62s, and x 63s. Calculate the percentage of squares falling into each of the three intervals, and compare with the corresponding percentages given by the Empirical Rule and Tchebysheff’s Theorem.

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