Tree Diameters

To assist in estimating the amount of lumber in a tract of timber, an owner decided to count the number of trees with diameters exceeding 12 inches in randomly selected 50-by-50-foot squares. 50 of these squares were randomly selected from the tract and the number of trees were counted for each.

Study questions and activities.

Construct a relative frequency histogram and a boxplot, and describe the shape of distribution.
Calculate summary statistics, IQR and standard deviation.
Do quartiles reflect their definition accurately? Describe your findings.
Which measure of center appears to best represent the center of the data?