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Review. 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: 142.03 ÷ 10 361.6 ÷ 16. FREQUENCY TABLE.

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**Review**confidential**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: • 142.03 ÷ 10 • 361.6 ÷ 16 confidential**FREQUENCY TABLE**• A frequency table lists each item in a data set with the number of times the item occurs. confidential**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. confidential**Frequency Table**confidential**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 confidential**Line Graph**• A line graph shows how an amount changes over time. confidential**Example**• Make a line graph for the following data given below: confidential**Answer**confidential**The following are number of vowels in a particular passage:**make a line graph Now your turn confidential**BREAK**confidential**Bar graphs**• A bar graph is used to compare amounts. A key identifies data that are compared. confidential**Example**• The following are the maximum temperature recorded at a place for thirty days Draw a bar graph. confidential**Answer**confidential**Now your turn**• The following table shows the number of children in families. Draw a bar graph confidential**Circle graphs**• A circle graph compares parts to a whole. confidential**Example**• Use the data in the table to make a circle graph. confidential**Now do it by yourself**• Construct a pie-graph for the following distributions confidential**Stem-and-Leaf Plot**• A stem-and-leaf plot orders data and lets you see the values and frequencies confidential**Example**ANSWER • 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 confidential**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 confidential**HAVE A BREAK!!!TRY TO SOLVE THIS ONE**http://www.thekidzpage.com/onlinejigsawpuzzles/kids-jigsaw-puzzles/12-piece-jigsaw/06-01-07-squirrel.html confidential**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. confidential**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 confidential**Practice Problems**• Find the mean, median and mode and range of 3, 7, 1, 9, 9, 5, 8, 6, 7, 9 confidential**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 confidential**More Practice Problems**• Construct bar graph, line graph and pie graph for the following frequency distribution. confidential**Answer the questions**• How many students took the test? • How many got marks 20 and above? • How many got single digit mark? • How many got 40 marks and more? • How many students got less than 30? • Has any body got 50? 12 10 8 6 4 2 10 20 30 40 50 confidential**That’s the End.**confidential

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