1. CONFIDENTIAL 1 BAR GRAPHS AND CIRCLE GRAPHS

2. 2 Review Following is the data regarding the number of candidates of 20 families. Represent it in the form of frequency table. 3, 4, 4, 0, 1, 4, 6, 0, 4, 6, 3, 0, 5, 4, 2, 2, 2, 2, 2, 1.

3. CONFIDENTIAL 3 Review Draw a line graph for the following table: Income500- 600 600- 700 700- 800 800- 900 900- 1000 No. of employees 60701008570

4. CONFIDENTIAL 4 Bar Graphs

5. 5 BAR GRAPHS A bar graph uses vertical or horizontal bars to display numerical information. We can use a bar graph to compare amounts.

6. CONFIDENTIAL 6 Making a Bar Graph To draw a bar graph, there must be a frequency table. Draw and label the horizontal and vertical axes. Choose a scale. Draw bars of equal widths. The heights will vary. Choose an appropriate title.

7. CONFIDENTIAL 7 Bar Graph NameNumber of siblings Ann3 Betsy1 Catherine2 Riyas1 Example: Draw a bar graph to represent the number of siblings of some of students

8. CONFIDENTIAL 8 BAR GRAPHS EXAMPLE : The final mathematics grade for 6 students are given below: GradesNumber of students A100 B250 C300 D120 E40 F20

9. CONFIDENTIAL 9 TRY THIS ONE!!! Draw a bar graph showing the average rainfall recorded from June to November in New York city JuneJulyAugustSeptemberOctoberNovember 20cm30cm42cm25cm15cm4cm

10. CONFIDENTIAL 10 Practice Problems The following table shows the interest paid by a company on external debts during the period from 1999 to 2004: Question.1 Year199920002001200220032004 interest230027003600410054006000 Draw a bar graph.

11. CONFIDENTIAL 11 Question 2 In the annual examination, the marks secured by students in Mathematics is as per data given below: Marks30-3940-4950-5960-6970-7980-8990-99 Number of Students 10563673 Draw a bar graph.

12. CONFIDENTIAL 12 Question 3 Represent the height of the students from the following table: Weight (in KG) 404142434445 Number of Students 8 3 7 5 5 2

13. CONFIDENTIAL 13 Double Bar You can plot two data set on the same graph to compare them more easily.

14. CONFIDENTIAL 14 Graphing Two Sets of Data An individual school gives different time periods to the subjects. Show it by a bar graph. SubjectsEnglishFrenchMathe- matics HistoryPhysicsGames/ library School A 9 6 9 6 9 3 School B 6 7 10 6 9 2

15. CONFIDENTIAL 15 Representation of Double Graph

16. CONFIDENTIAL 16 Double Graphs The following table shows the production of scooters and cars by a company over a period from 2001 to 2005. Draw a double bar graph. Years20012002200320042005 Scooters480,000380,000400,000600,000620,000 Cars122,000200,000212,000280,000320,000

17. CONFIDENTIAL 17 Making a Double Bar Graph

18. CONFIDENTIAL 18 Now your turn!! The following data gives the education level of males and females: Education Level Number of females Number of males Elementary9189 Middle521 High3540 Graduate and above 4550

19. CONFIDENTIAL 19 Break

20. CONFIDENTIAL 20 Solve this puzzle http://www.thekidzpage.com/onlinejigsawp uzzles/kids-jigsaw-puzzles/12-piece- jigsaw/12-27-06-uppity.html http://www.thekidzpage.com/onlinejigsawp uzzles/kids-jigsaw-puzzles/12-piece- jigsaw/12-27-06-uppity.html

21. CONFIDENTIAL 21 CIRCLE GRAPHS

22. CONFIDENTIAL 22 Circle Graph A Circle graph is a graph of data where the entire circle represents the whole. Each wedge in the circle represents part of the whole.

23. CONFIDENTIAL 23 Circle Graph A circle graph is often called a pie chart. Each wedge of a circle graph is like a “piece of the pie”.

24. CONFIDENTIAL 24 Reading A Circle Graph 48 % 26% 13% Eaten fresh Decay processed exported a.For what purpose are 48% of apples used ? Answer : eaten fresh b.What percent of apples are exported ? Answer : 26% c.What percent of apples are decay? Answer : 13% APPLES

25. CONFIDENTIAL 25 Making a Circle Graph First, use a calculator to change the data to percents of the total. Round to the nearest percent. Use number sense to divide the circle.

26. CONFIDENTIAL 26 Example 1 In 2006, the baseball players scored a total of 500 home runs in the various matches. Make a circle graph. PlayersRuns 1213 2120 3112 4 33 5 22 Total number of homeruns 500

27. CONFIDENTIAL 27 Converting data into percent Data into percent 213 = 43% 500 120 = 24 % 500 112 = 22 % 500 33 = 7% 500 22 =4 % 500 43% 24% 22% 7% 4%

28. CONFIDENTIAL 28 EXAMPLE 2 Construct a pie-chart for the following frequency table: Marks10-1920-2930-3940-4950-59 Number of students 152035104

29. CONFIDENTIAL 29 Conversion of data into percent and constructing a pie-chart 15 = 18% 84 20 = 24% 84 35 = 42% 84 10 = 12% 84 4 = 5% 84

30. CONFIDENTIAL 30 Try to do this by yourself Construct a pie-chart for the following frequency table: X0-1010-2020-3030-40 F471018

31. CONFIDENTIAL 31 ASSESSMENT 1. Represent the following data by means of a pie-chart: Weekly wages: 10-15 15-20 20-25 25-30 30-40 40-50 Number of : 7 19 27 15 12 12 Workers 2. Draw a circle graph: Daily wagesfrequency 25-302 30-359 35-4012 40-456 45-501

32. CONFIDENTIAL 32 3. Represent the following frequency table on the same bar diagram 151425-30 262120-25 322915-20 403510-15 38285-10 25150-5 Village A Number of inhabitants Age Group Village B ASSESSMENT

33. CONFIDENTIAL 33 ASSESSMENT 4.The following table gives the marks obtained (out of 50) by 102 students in a test: marks2022232426313843 Frequency815282720211 Draw a bar graph.

34. CONFIDENTIAL 34 Review Bar graph: A bar graph uses vertical or horizontal bars to display numerical information. Double Bar: We can plot two data sets on the same graph to compare them more easily. Circle graph: It is a graph of data where the entire circle represents the whole. Each wedge represents part of the whole.

35. CONFIDENTIAL 35 That’s all for today.