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This shows two horizontal lines. Both lines are marked and labelled with a scale in one unit intervals from 47 to 71. The top line is labelled “Heights of sunflowers of variety A (in.).” Dots are plotted on the line at 55, 58, 59, 60, 62, 65, and 66. A second dot is plotted immediately above the dot at 55, to indicate that two sunflowers had a height of 55 in. The second line is marked and labelled with a scale in one unit intervals from 47 to 71. The line is labelled “Heights of sunflowers of variety B (in.).’ Dots are plotted on the line at 50, 52, 54, 60, 61, 67, and 69. A second dot is plotted immediately above the dot at 67.

 11.1.7 Measuring the Spread of a Data Set