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Section 2-7

Using Measures of Central Tendency



Objective 2

Stem-and-Leaf Plots


You can use a stem-and-leaf plot to organize data. A stem-and-leaf plot is a display of data made by using the digits of the values. To make a stem-and-leaf plot, separate each number into a stem and a leaf. This is the stem and leaf for the number 1.54.

stem-and-leaf plot diagram

Example 4 Making a Stem-and-Leaf Plot

Make a stem-and-leaf plot for the data at the left.

solution

You can find the measures of central tendency of data displayed in a stem-and-leaf plot. The stem-and-leaf plot in the next example is a back-to-back stem-and-leaf plot. The stem is between the two bars, and the leaves are on each side. Leaves are in increasing order from the stems.

Example 5 Using a Stem-and-Leaf Plot

Find the mean of the city mileage and highway mileage for nine new cars.

solution


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