7th Grade Math

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Statistical Displays

PART A B CDE

Multi-Part

Lesson 3

GLE 0706.5.1

Collect, organize, and analyze

both single- and two-variable

data. GLE 0706.5.2 Select,

create, and use appropriate

graphical representations of

data. Also addresses

GLE 0706.5.4, SPI 0706.5.1,

SPI 0706.5.2.

514 Statistical Displays

Main Idea

Construct and analyze

circle graphs.

Vocabulary

circle graph

Circle Graphs

VEGETABLES The students at Pine Ridge Middle Favorite Vegetable

Vegetable Percent

Carrots 45%

Green Beans 23%

Peas 17%

Other 15%

School were asked to identify their favorite

vegetable. The table shows the results of the

survey.

1. Explain how you know that each student
   selected only one favorite vegetable.


2. If 400 students participated in the survey,
   how many students preferred carrots?

One graph that shows data as parts of a whole is called a circle graph.

In a circle graph, the percents add up to 100.

Display Data in a Circle Graph

VEGETABLES Display the data above in a circle graph.

• There are 360° in a circle. Determine what part of the circle will
  represent each percent from the table above.
  45% of 360° = 0.45 · 360° or 162°
  23% of 360° = 0.23 · 360° or 83° Round to the nearest whole degree.
  17% of 360° = 0.17 · 360° or about 61°
  15% of 360° = 0.15 · 360° or about 54°


• Draw a circle with a radius as shown. Then use a protractor to
  draw the first angle, in this case 162°. Repeat this step.

162 ° 162 °

83 °

61 °

54 °

• Label each section of the graph

$BSSPUT



0UIFS



1FBT



(SFFO

CFBOT



Favorite Vegetable

with the category and percent.

Label the graph with a title.

Check

162° + 83° + 61° + 54° = 360° 

V

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513_531_C09_L3_895130.indd 514 1/11/10 9:39 AM