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Example 2-3b Objective Construct and interpret circle graphs

Example 2-3b Vocabulary Circle graph A type of statistical graph used to compare parts of a whole

Example 2-3b Vocabulary Ratio A comparison of two numbers by division

Example 2-3b Vocabulary Percent equation Part = percent  base

Lesson 2 Contents Example 1Construct a Circle Graph Example 2Construct a Circle Graph Example 3Interpret a Circle Graph

Example 2-1a SPORTS In a survey, a group of middle school students were asked to name their favorite sport. The results are shown in the table. Make a circle graph of the data. SportPercent football30% basketball25% baseball22% tennis 8% other15% 1/3

Example 2-1a SportPercent football30% basketball25% baseball22% tennis 8% other15% /3 Find the degrees for each part. Round to the nearest whole degree. Football:30% of = Basketball:25% of = Baseball:22% of = Tennis: 8% of = Other:15% of = To check accuracy, add the degrees and should equal

Example 2-1a /3 Football:30% of = Basketball:25% of = Baseball:22% of = Tennis: 8% of = Other:15% of = Draw a circle on paper using a protractor Draw a radius in the circle Using a protractor, draw a line around the circle from the radius Label Football 30% Football 30%

Example 2-1a /3 Football:30% of = Basketball:25% of = Baseball:22% of = Tennis: 8% of = Other:15% of = Draw a line 90 0 around the circle from the last line drawn Football 30% Basketball 25% Label Basketball 25% Draw a line 79 0 around the circle from the last line drawn Label Baseball 22% Baseball 22% Draw a line 29 0 around the circle from the last line drawn Label Tennis 8% Tennis 8%

Example 2-1a /3 Football:30% of = Basketball:25% of = Baseball:22% of = Tennis: 8% of = Other:15% of = The last one only needs to be labeled Football 30% Basketball 25% Label Other 15% Baseball 22% Tennis 8% Other 15%

Example 2-1a 1/3 Give the graph a title Football 30% Basketball 25% Baseball 22% Tennis 8% Other 15% In a survey, a group of middle school students were asked to name their favorite sport. Student’s Favorite Sport Answer:

Example 2-1b ICE CREAM In a survey, a group of students were asked to name their favorite flavor of ice cream. The results are shown in the table. Make a circle graph of the data. FlavorPercent chocolate 30% cookie dough 25% peanut butter 15% strawberry 10% other 20% 1/3

Example 2-1b Answer: 1/3

Example 2-2a MOVIES Gina has the following types of movies in her DVD collection. Make a circle graph of the data. Type of MovieNumber action24 comedy15 science fiction 7 2/3 Since percent is needed for a circle graph, must find percent of each type of movie

Example 2-2a MOVIES Gina has the following types of movies in her DVD collection. Make a circle graph of the data. Type of MovieNumber action24 comedy15 science fiction 7 2/3 To find percent, divide type of movie by total movies so find total =46

Example 2-2a MOVIES Gina has the following types of movies in her DVD collection. Make a circle graph of the data. Type of MovieNumber action24 comedy15 science fiction 7 2/3 Divide 24 by Action: 46 Multiply by 100 to make percent Round to nearest whole number 52%

Example 2-2a MOVIES Gina has the following types of movies in her DVD collection. Make a circle graph of the data. Type of MovieNumber action24 comedy15 science fiction 7 2/3 Divide 15 by Action: 46 Multiply by 100 to make percent Round to nearest whole number 52% Comedy %

Example 2-2a MOVIES Gina has the following types of movies in her DVD collection. Make a circle graph of the data. Type of MovieNumber action24 comedy15 science fiction 7 2/3 Divide 7 by Action: 46 Multiply by 100 to make percent Round to nearest whole number 52% Comedy % Sci Fi %

Example 2-2a MOVIES Gina has the following types of movies in her DVD collection. Make a circle graph of the data. Type of MovieNumber action24 comedy15 science fiction 7 2/3 Total % should be 100% so check by adding % 24 Action: 46 52% Comedy % Sci Fi % 100%

Example 2-2a MOVIES Gina has the following types of movies in her DVD collection. Make a circle graph of the data. Type of MovieNumber action24 comedy15 science fiction 7 2/3 Find the number of degrees in each category for the circle graph 24 Action: 46 52% Comedy % Sci Fi % Multiply by 52% 187 0

Example 2-2a MOVIES Gina has the following types of movies in her DVD collection. Make a circle graph of the data. Type of MovieNumber action24 comedy15 science fiction 7 2/3 24 Action: 46 52% Comedy % Sci Fi % Multiply by 33% Multiply by 15% 54 0 To check accuracy, add the degrees and should equal

Example 2-2a MOVIES Gina has the following types of movies in her DVD collection. Make a circle graph of the data. 2/3 24 Action: 46 52% Comedy % Sci Fi % Draw a circle on paper using a protractor Draw a radius in the circle Using a protractor, draw a line around the circle from the radius Action 52% Label Action 52%

Example 2-2a MOVIES Gina has the following types of movies in her DVD collection. Make a circle graph of the data. 2/3 24 Action: 46 52% Comedy % Sci Fi % Action 52% Label Comedy 33% Draw a line around the circle from the last line drawn Comedy 33% The last one only needs to be labeled Label Sci Fi 15% Sci Fi 15%

Example 2-2a MOVIES Gina has the following types of movies in her DVD collection. Make a circle graph of the data. 2/3 Action 52% Comedy 33% Sci Fi 15% Give the graph a title Type of Movies Answer:

Example 2-2b MARBLES Michael has the following colors of marbles in his marble collection. Make a circle graph of the data. ColorNumber Black 12 Green 9 Red 5 Gold 3 Answer: 2/3

Example 2-3a VOTING The circle graph below shows the percent of voters in a town who are registered with a political party. Use the graph to describe the voters in this town. By looking at the circle graph, over half of the voters are Democrats 3/3 The majority of voters are Democrats Answer:

Example 2-3b SPORTS The circle graph below shows the responses of middle school students to the question, “Should teens be allowed to play professional sports?”. Use the graph to describe the opinions of the middle school students. Answer: The students felt that teens should be allowed to play professional sports. * 3/3

End of Lesson 2 Assignment Lesson 10:2Making Circle Graphs All

Example 2-1a Check To draw an accurate circle graph, make sure the sum of the angle measures equals 360°. Label each section of the graph with the category and percent. Give the graph a title. Answer: Students’ Favorite Sports NOTE: The percentage and label are included 1/3