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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. ANSWERS. 0.12, 0.13, 0.21, 0.35, 0.45
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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
ANSWERS • 0.12, 0.13, 0.21, 0.35, 0.45 • 177.37 • 1.06 • 14.203 • 22.6 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
ANSWER 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
Answer 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
ANSWER 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
ANSWER 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 WEIGHTS KEY: 2|3 MEANS 23 2 3 4 5 6 • 5 7 • 3 5 6 7 • 0 2 3 4 5 • 6 • 7 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 • MEAN = 3+7+1+9+9+5+8+6+7+9 10 = 6.4 MEDIAN = 7 MODE = 9 confidential
Revision Questions • What is the mean of 36, 32, 55, 81, 31, 35? • 45 • What is the median of the above data? • 35.5 • What is the mode of 3,4,5,6,3,3,2,3,4,4,5,6,7? • MODE =3 • 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
FREQUENCY TABLE confidential
More Practice Problems • Construct bar graph, line graph and pie graph for the following frequency distribution. confidential
GRAPHS confidential
Answer the questions 12 • How many students took the test? ANS: 32 • How many got marks 20 and above, but less than 30? ANS:10 • How many got single digit mark? ans: 4 • How many got 40 marks and more? Ans : 3 • How many students got less than 30? Ans: 21 • Has any body got 50? Ans: No 10 8 6 4 2 10 20 30 40 50 confidential
That’s the End. confidential