EXAMPLE 4 Constructing a pie chart
Construct a pie chart for the app type data from Example 2.
Solution
The relative frequencies from Example 2 are shown in Table 5. We multiply each relative frequency by 360° to get the number of degrees for that section (slice) of the pie chart.
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Variable: app type | Relative frequency | Multiply by 360° | Degrees for that section |
---|---|---|---|
Games | |||
Social networking | |||
Music | |||
Photo and video | |||
Sports | |||
Total |
Our pie chart will have five slices—one for each app type category. Use the compass to draw a circle. Then, use the protractor to construct the appropriate angles for each section. From the center of the circle, draw a line to the top of the circle. Measure your first angle using this line. For the Games app type, we need an angle of 126°. This angle is shown in Figure 3. Then, from there, measure your second angle—in this case, the 90° right angle for Social networking apps. Continue until your circle is complete.
NOW YOU CAN DO
Exercises 19, 20, 35, and 36.