# PDM7-9 Tallies and Frequency Tables PDM7-10 Circle Graphs Pages 63 65

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1 PDM7-9 Tallies and Frequency Tables PDM7-10 Circle Graphs Pages Curriculum Expectations Ontario: 7m3, 7m5, 7m6, 7m7, 7m78 WNCP: 7SP3, [V, C] Vocabulary tally frequency table relative frequency table fraction percent circle graph Goals Students will use relative frequency tables to construct circle graphs from circles already divided into 100 equal parts. PRIOR KNOWLEDGE REQUIRED Can convert between tallies and numerals Can convert between fractions and percents Understands when to use the mean, median, or mode Materials BLM A Large Circle Graph (p N-40) BLM Small Circle Graphs (p N-41) Introduce relative frequency tables with fractions. Tell students that you surveyed 80 students in grades 7 and 8 about their favourite type of movie. You tallied the results as follows: Comedy Action Horror Other Favourite type of movie Have students use the data to complete this relative frequency table: Type of Movie Number of People Fraction of People Comedy 12 12/80 = 3/20 Action Horror Other Point out that the table shows both the number of times a data value occurs in a set (e.g., comedy is the favourite for 12 people) and the fraction of time each data value occurs (e.g., comedy is the favourite for 12/80 people). (A frequency table shows only the former.) Encourage students to add the total numbers and fractions. ASK: What should the numbers add to? (80) Why? (because you surveyed 80 people) Probability and Data Management 7-9, 10 N-15

4 Class E: Red: 10% Blue: 15% Yellow: 25% Other: 50% Class F: Red: 18% Blue: 15% Yellow: 26% Other: 31% ASK: Which data did you have trouble graphing? (data for classes A, D, and F) Why? (because they total either more or less than 100%) Process ExpectatioN Reflecting on the reasonableness of an answer Explain that the percents in a circle graph must always total 100%. This is because when you count all the data, you count 100% of it. Encourage students to use this to check their work for the relative frequency table in Question 4, on Workbook page 65, before completing the circle graph. A tip for struggling students. In Question 3c), Calli surveyed 200 students, so each 1 marking on her graph represents 2 students, whereas Bilal surveyed only 50 students, so 2 markings on his graph represent 1 student. Noticing this can make it easier to fill in the graphs: divide the number of students by 2 to get the number of markings for each section on Calli s graph, and multiply the number of students by 2 to get the number of markings on Bilal s graph. After students finish Workbook page 65 Question 3. Have students perform the survey, to determine whose school really is more like theirs, and compare the result to their prediction in part e). Process ExpectatioN Representing Circle graphs that look different can still represent the same data. Draw two circle graphs that show the same data (you can use BLM Large Circle Graph) but rotate one of the graphs 90 before you label it. Discuss how the graphs are different and how they are the same. Emphasize that two circle graphs can represent the same data even though they look different. Then include a circle graph that shows the same data but in a different order, and discuss again how the graphs look different though the data is the same. ACTIVITY Circle graph posters. Encourage students to look for circle graphs in books, in magazines, on the Internet, on TV (e.g., on the weather network) or in brochures (e.g., from financial institutions). Have students record properties that are common to all the circle graphs. How many categories are used in each circle graph? About how many categories do most circle graphs use? Have students cut out various circle graphs and make a poster titled Circle Graphs. Keep these posters for PDM7-14. N-18 Teacher s Guide for Workbook 7.2

5 PDM7-11 Drawing Circle Graphs PDM7-12 Reading Circle Graphs Pages Curriculum Expectations Ontario: 7m2, 7m5, 7m6, 7m7, 7m78, 7m79 WNCP: 7SP3, [R, CN, T, C] Vocabulary circle graph percent Goals Students will draw circle graphs by determining what angle in a circle each percentage corresponds to. PRIOR KNOWLEDGE REQUIRED Can read and draw simple circle graphs Knows that the total sum of angles in a circle is 360 Knows that the total sum of percentages is 100% Can calculate a percentage of a number Can calculate a fraction of a number Can convert fractions to decimals, including repeating decimals Materials BLM A Large Circle Graph (p N-40) compasses and protractors Have students draw a circle graph, using BLM Large Circle Graph, with the following data about the percent of people who use each mode of transportation to get to school: Bus: 30% Bike: 25% Walk: 20% Car: 15% Other: 10% Then, have students use a protractor to measure the angle of each region (or pie piece ) to fill in the following chart: Mode of Transportation Percent Angle in Circle Bus Bike Walk Car Other The angles in a circle add to 360. When students are finished the chart, have them add the angles. What do they total? (360 ) Why? (because the central angles of a circle add to 360 ) Use the angles to verify percentages of 360. ASK: The percentage of people biking to school was 25% and the angle you found was 90. Probability and Data Management 7-11, 12 N-19

6 Process ExpectatioN Connecting ASK: Does that make sense? Why? (yes, because 90 is 25% of 360 ) Demonstrate this to students. First, remind students how to find the percentage of a number. For example, to find 25% of 360, write 25% as a fraction (25/100 or 1/4) and then replace of with. So 25% of 360 = 25/ = = 90. Or, write 25% as 1/4 to obtain 1/4 360 = = 90. A quick explanation of why this works: To find 1% of 360, divide 360 by 100. But 25% of 360 is 25 times more than 1% of 360, so 25% of 360 is = 90. Have students use this method to verify the angles they measured: Does the percentage of 360 you calculate for each mode of transportation match the measurement? Drawing circle graphs using a protractor. First mark the centre of a circle you will draw, then draw a circle with radius about 3 cm around that centre point using a compass. Draw a line from the edge of the circle to the centre of the circle (a radius). Demonstrate drawing a circle graph from the data above. Emphasize that this circle is not already divided into 100 equal parts, so students now have to use the angle in the circle to draw the regions. Have students do questions similar to Workbook page 67 Question 2, but have them draw the circle themselves using a compass. Students should be sure to mark the centre point first, so that they can draw a line from the centre to any point on the circle; this will help them create the first region. EXAMPLE: Survey results: Favourite kind of snack Percent Vegetables 30% Crackers 10% Chips 25% Fruit 15% Other 20% Angle in Circle Review writing fractions as percents. See Workbook page 68 Question 3. Writing fractions with denominator 360. See Workbook page 68 Question 4. Not all fractions can be written this way, but if they can, the corresponding angle in a circle is particularly easy to find it is just the numerator of the fraction with denominator 360. All fractions that students will find in Workbook page 68 Question 5 can be written this way. Find the percentage of 360 that a given angle represents. See Workbook page 69 Questions 1 3. For Questions 2 and 3, students will need to measure the angle first and then determine which percentage of 360 the angle represents. Sometimes the angle in a circle does not correspond to a whole number percent of 360. Provide the example shown in the box at the top of Workbook page 70. N-20 Teacher s Guide for Workbook 7.2

7 Process ExpectatioN Technology Review changing fractions to decimals. Use long division or estimation, then check your answer on a calculator. See Workbook page 70 Question 4. Find the decimal percentage of 360 that a given angle represents. Have students round to one decimal place. See Workbook page 70 Question 5. Show students the steps required to draw a circle graph, when the circle is not already divided into 100 parts. Example: In a grade 7 class, 10 students walk to school, 5 travel by bus, 5 bicycle, and 5 skateboard. Step 1: Find the total number of students. (25) Step 2: Express each piece of data as a fraction of the total (reduce to lowest terms) = walk = bus = bicycle = skateboard Step 3: Change each fraction to an equivalent fraction out of =? = The angle for the part of the circle graph that represents the students who walked to school should be =? = The angle for the parts of the graph that represent the students who bicycled, rode the bus, or skateboarded to school should each be 72. Step 4: Draw a circle and then draw a radius. Step 5: Use a protractor to construct a radius for each of the angles you found in step Step 6: Title and label the circle graph. Include the fraction or percent of the total that each region represents. Probability and Data Management 7-11, 12 N-21

8 How we get to school Bus 1 5 = 20% Bike 1 5 = 20% Walk 2 5 = 40% Skateboard 1 5 = 20% Have students do Workbook Question 6. Notice that the total is found to be 100% for part c), but not for part d). Emphasize that this is because rounding makes the results less accurate and hence can make the total appear to be different from 100%. PROCESS ExPECTATION Mental math and estimation, Using logical reasoning Importance of drawing the angles accurately. Ask students how the following circle graph is misleading. (Students should be able to estimate what the angles should look like. For instance 3/5 is greater than 1/2, but the part marked H covers less than 1/2 the circle. Also 1/5 is double 1/10 so the parts marked B and S should each cover twice as much area as the part marked O.) Favourite sport H: Hockey 3 5 B: Baseball 1 5 S: Soccer 1 5 O: Other 1 10 B O H S Ask students why it is important to measure each angle accurately when drawing a circle graph. Extensions PROCESS ExPECTATION Using logical reasoning 1. The following question is based on an actual reasoning mistake seen on a web page. An opinion poll asks people to strongly agree, agree, disagree, or strongly disagree with an opinion. Here s the graph representing the answers of a group of adults who were surveyed: Agree Strongly Disagree Disagree Strongly Agree What fraction of people surveyed: Agree? Disagree? Strongly agree? Strongly disagree? What fraction of people surveyed either agree or strongly agree? The survey concludes: Not counting the lunatic 1/10 of people who strongly disagree, only 4/10 of people disagree with us. Is this correct? Explain. N-22 Teacher s Guide for Workbook 7.2

9 Answer: No, this conclusion is incorrect. Out of 10 people, you would expect 3 to agree, 2 to strongly agree, 4 to disagree, and 1 to strongly disagree. If you aren t going to count the 1 who strongly disagrees, you have to remove 1 from the total: the fraction of people who disagree is 4/9. This is slightly more than 4/10. As well, the data shows that 50% of people disagree with the opinion. (Note: the number of people who disagree is the number of people who disagree to any extent, so the number who disagree plus the number who strongly disagree. ) ASK: Does the circle graph show this? (yes, but it s not obvious) Have students redraw the circle graph so that this fact that 50% of people disagree is prominent (put the disagree and strongly disagree sections next to each other). 2. The following data shows the number of deaths due to each recreational activity in one year. Boating 80 Swimming 40 Biking 36 Jet skiing 4 a) Make a frequency table showing the fraction of deaths due to each recreational activity. b) Draw a circle graph showing the data. c) Can you conclude that biking is more dangerous than jet skiing? Why or why not? What extra information would be relevant? (For example, the number of hours people spend biking is likely significantly larger than the number of hours people spend jet skiing, so even if jet skiing is more dangerous per hour, there could still be a lot more deaths from biking than deaths from jet skiing.) Probability and Data Management 7-11, 12 N-23

10 PDM7-13 Page 71 Using Circle Graphs for Mean, Median, and Mode Curriculum Expectations Ontario: 7m2, 7m5, 7m6, 7m7, 7m78, 7m80 WNCP: 7SP1, 7SP3, [R, CN, V, C] Vocabulary frequency relative frequency mean median mode circle graph Process ExpectatioN Connecting Goals Students will find the mean, median, and mode using the relative frequency of data values instead of the frequency of data values. PRIOR KNOWLEDGE REQUIRED Can make relative frequency tables from frequency tables Can draw and read circle graphs Can find the mean, median, and mode from given frequency tables Understands that a b = (a c) (b c) Using circle graphs to find the mean, median, and mode. Tell students that you surveyed 80 people about the number of cars their family has. Show the data in the first two columns of this relative frequency table and have students fill in the last column. Number of Cars in Family Number of People Fraction of People 0 8 1/ / / / /20 ASK: Out of every 20 people who answered the survey, how many families have no cars? (2) Repeat for 1 car (5), 2 cars (8), 3 cars (4), and 4 cars (1). Write down the data for 20 people: Have students find the mean, median, and mode number of cars for these 20 data values. (Answers: mean: 1.85, mode: 2, median: 2) Then remind students that there were not actually 20 people surveyed, but 80 people. Since these are the data for every 20 people, the actual data set is: Discuss how to find the new mean, mode, and median. The new sum of data values is ( ) 4 = old sum 4. N-24 Teacher s Guide for Workbook 7.2

11 The new number of data values is just the old number of data values multiplied by 4, so the new mean is: (old sum of data values) 4 ol (old number of data values) 4 = d sum of data values old number of data values = old mean The new median is also the same: the middle number (2) is still in the middle. Why? Each value now occurs four times as often. Since half the data values were 2 or less and half were 2 or more to start, there are now four times as many that are 2 or less and four times as many that are 2 or more, so the same number of data values are still 2 or less as are 2 or more. Finally, the new mode is also the same: whichever data value was most common before each one was repeated the same number of times is still the most common! Tell students that they have just shown that, instead of using the frequencies of each data value to find the mean, median, and mode, they can use the relative frequencies. Even if you survey a million families, you can find the percentage of families with each number of cars, and then find the mean, median, and mode, as though you only surveyed 100 people. Display this circle graph: Number of cars per family in Country A Measure together the angle for the 0 region. ASK: What percentage of families have 0 cars? (Write the fraction 54/360 as a fraction over 100: 54/360 = 15/100, so 15%.) Repeat for 1 car (126, 35%), 2 cars (90, 25%), 3 cars (54, 15%), 4 cars ( 36, 10%). Then ASK: Out of every 100 families, how many have 0 cars? (15) Repeat for 1 car (35), 2 cars (25), 3 cars (15), 4 cars (10). Tell students to pretend that there are only 100 families in the country. ASK: What are the mean, median, and mode for every 100 families? Answers: mean: = median: Since the circle graph has the data values in order around the circle, the half way point is found by drawing a diameter from before the region for 0 cars the diameter is exactly between the regions for 1 and 2 cars, so the median is 1.5 mode: the largest region on the circle graph is for 1 car so 1 is the mode ASK: How does this tell you the mean, median, and mode for the whole country? (they are the same, because you can think of the country as divided into many groups of 100 families, all repeating the same data values, i.e., 15 with no cars, 35 with 1 car, and so on) Probability and Data Management 7-13 N-25

13 NAME DATE A Large Circle Graph COPYRIGHT 2010 JUMP MATH: TO BE COPIED N-40 Blackline Master Probability and Data Management Teacher s Guide for Workbook 7.2

14 NAME DATE Small Circle Graphs COPYRIGHT 2010 JUMP MATH: TO BE COPIED Blackline Master Probability and Data Management Teacher s Guide for Workbook 7.2 N-41

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