1. confidential1 Review

2. confidential2 Let’s check what you know 1. Order from least to greatest 1. 0.12, 0.13, 0.45, 0.35, 0.21 2. Find the sum 1. 6.09+152.3+1.5+4.98+12.5 3. Find the difference 1. 10.42-9.36 4. Find the quotient: 1. 142.03 ÷ 10 2. 361.6 ÷ 16

3. confidential3 FREQUENCY TABLE A frequency table lists each item in a data set with the number of times the item occurs.

4. confidential4 Example to draw a frequency table Read the following passage: Photosynthesis is a process by which the green plants synthesize organic matter in the presence of light with the help of chlorophyll. During photosynthesize light is converted into chemical energy. Make a frequency table showing the number of times each vowel occurs in the paragraph.

5. confidential5 Frequency Table Number of times vowels occur VowelsTallyFrequency A IIII 5 E IIII IIII 20 I IIII IIII IIII 14 O IIII IIII II 11 U I 1 TOTAL51

6. confidential6 NOW YOUR TURN!!! Marks of 30 students in a test given below. Prepare a frequency table taking each score as one item. 7, 6, 3, 5, 4, 0, 1, 2, 5, 3, 4, 7, 3, 1, 0, 2, 5, 6, 7, 2, 3, 4, 6, 3, 2, 1, 2, 3, 4, 5

7. confidential7 Line Graph A line graph shows how an amount changes over time.

8. confidential8 Example Make a line graph for the following data given below: Ticket price YearPrice 1970$10 1975$15 1980$20 1985$25 1990$30

9. confidential9 Answer

10. confidential10 Now your turn Number of times vowels occur VowelsFrequency A5 E20 I14 O11 U1 The following are number of vowels in a particular passage: make a line graph

11. confidential11 BREAK

12. confidential12 Bar graphs A bar graph is used to compare amounts. A key identifies data that are compared.

13. confidential13 Example The following are the maximum temperature recorded at a place for thirty days TemperatureDays 264 276 287 294 306 313 Draw a bar graph.

14. confidential14 Answer

15. confidential15 Now your turn The following table shows the number of children in families. Draw a bar graph No. of. Chil dren 0123456 No. of.fa mily 67155773

16. confidential16 Circle graphs A circle graph compares parts to a whole.

17. confidential17 Example Use the data in the table to make a circle graph. MysteriesBio- graphies FictionHumor 30403530

18. confidential18 Now do it by yourself Construct a pie-graph for the following distributions X 0-1010-2020-3030-40 F471018

19. confidential19 Stem-and-Leaf Plot A stem-and-leaf plot orders data and lets you see the values and frequencies

20. confidential20 Example Make a stem-and-leaf plot of the data: 507, 301, 479, 367, 543, 388, 512, 479, 483, 379, 548, 341, 399, 465 3 01 41 67 79 88 99 4 65 79 79 83 5 07 12 43 48 Key: 4|65 means 465 ANSWER

21. confidential21 DO THIS NOW Make a stem and leaf plot for the respective weights of a particular group. 35,56,45, 67,23,33, 43,37,40, 52, 25, 44, 42, 27, 36

22. confidential22 HAVE A BREAK!!! TRY TO SOLVE THIS ONE http://www.thekidzpage.com/onlinejigsawpuzzles/kids-jigsaw-puzzles/12-piece- jigsaw/06-01-07-squirrel.htmlwww.thekidzpage.com/onlinejigsawpuzzles/kids-jigsaw-puzzles/12-piece- jigsaw/06-01-07-squirrel.html

23. confidential23 Mean, Median, Mode and Range The mean of a set of data is the sum of the values divided by the number of data items. The median is the middle value when data is arranged in numerical order. The mode is the value or item that appears most often. Range is the difference between the smallest and greatest value.

24. confidential24 Exercise Find the mean, median and mode and range of 34, 49, 63, 43, 50, 50, 26, Mean = 34+49+63+43+50+50+26 7 = 45 Median = middle value (26, 34, 43, 49, 50, 50, 63) = 49 Mode = 50 Range = 63 – 26 = 37

25. confidential25 Practice Problems Find the mean, median and mode and range of 3, 7, 1, 9, 9, 5, 8, 6, 7, 9

26. confidential26 Revision Questions What is the mean of 36, 32, 55, 81, 31, 35? What is the median of the above data? What is the mode of 3,4,5,6,3,3,2,3,4,4,5,6,7? Prepare a frequency table for the following data. 25, 23, 25, 26,23, 25, 24, 29, 28, 27, 29, 24, 24, 24, 25, 26, 23, 23, 28, 30

27. confidential27 More Practice Problems Construct bar graph, line graph and pie graph for the following frequency distribution. Marks10-1920 – 2930 – 3940 – 4950 – 59 Number of students 152035104

28. confidential28 Answer the questions 10 20 30 40 50 2 4 6 8 10 12 A.How many students took the test? B.How many got marks 20 and above? C.How many got single digit mark? D.How many got 40 marks and more? E.How many students got less than 30? F.Has any body got 50?

29. confidential29 That’s the End.