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Review

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Let’s check what you know

1. Order from least to greatest 1. 0.12, 0.13, 0.45, 0.35, 0.212. Find the sum 1. 6.09+152.3+1.5+4.98+12.53. Find the difference 1. 10.42-9.364. Find the quotient:1. 142.03 ÷ 102. 361.6 ÷ 16

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FREQUENCY TABLE

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

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Example to draw a frequency tableRead 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.

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Frequency Table

Number of times vowels occurVowels Tally Frequenc

y A IIII 5E IIII IIII IIII IIII 20I IIII IIII IIII 14O IIII IIII II 11U I 1TOTAL 51

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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

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Line Graph

A line graph shows how an amount changes over time.

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Example Make a line graph for the following

data given below:

Ticket priceYear Price 1970 $101975 $151980 $201985 $251990 $30

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Answer

05

101520253035

1970 1975 1980 1985 1990

price

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Now your turn

Number of times vowels occurVowels Frequency A 5E 20I 14O 11U 1

The following are number of vowels in a particular passage: make a line graph

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BREAK

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Bar graphs

A bar graph is used to compare amounts. A key identifies data that are compared.

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Example

The following are the maximum temperature recorded at a place for thirty days

Temperature Days 26 427 628 729 430 631 3

Draw a bar graph.

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Answer

01234567

26 27 28 29 30 31

days

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Now your turn The following table shows the number of

children in families. Draw a bar graph

No.of.Children

0 1 2 3 4 5 6

No.of.family

6 7 15 5 7 7 3

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Circle graphs A circle graph compares

parts to a whole.

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Example Use the data in the table to

make a circle graph.

mysteriesbiographiesfictionhumor

Mysteries

Bio-graphies

Fiction Humor

30 40 35 30

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Now do it by yourself

Construct a pie-graph for the following distributions

X 0-10 10-20 20-30 30-40

F 4 7 10 18

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Stem-and-Leaf Plot

A stem-and-leaf plot orders data and lets you see the values and frequencies

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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 88 994 65 79 79 835 07 12 43 48

Key: 4|65 means 465

ANSWER

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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

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HAVE A BREAK!!!TRY TO SOLVE THIS ONE

http://www.thekidzpage.com/onlinejigsawpuzzles/kids-jigsaw-puzzles/12-piece-jigsaw/06-01-07-squirrel.html

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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.

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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

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Practice Problems

Find the mean, median and mode and range of 3, 7, 1, 9, 9, 5, 8, 6, 7, 9

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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

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More Practice Problems

Construct bar graph, line graph and pie graph for the following frequency distribution.

Marks 10-19 20 – 29

30 – 39

40 – 49

50 – 59

Numberof students

15 20 35 10 4

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Answer the questions

10 20 30 40 50

2

4

6

8

10

12A. 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?

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That’s the End.