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FREQUENCY TABLES FREQUENCY TABLES AND LINE GRAPHSAND LINE GRAPHS

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FREQUENCY TABLESFREQUENCY TABLES

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ReviewReview• Arrange the following numbers in ascending

order:

a) 145,140,150,149,142,147,141,146,151,148

Arrange the following numbers in descending order:

a) 90,75,80,65,78,55,56, 77,86,68,74,79,91

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FREQUENCY TABLESFREQUENCY TABLES

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

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Frequency tablesFrequency tables

• We use tally marks to represent the number of repeated items.

• Tally mark is denoted by a vertical line

• For example: 3 = and 5 =

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Frequency tablesFrequency tables

squaresquare

trianglecircle

trianglesquare

squarecircle

squareTriangles

Shapes

Shapes Tally Number

Triangle III 3

Square IIII 4

Circle II 2

The frequency table is:

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Frequency tablesFrequency tables

• ∆ ○⌂ ⌂ ∆□ ∆○ ∆ ⌂

• ○∆ ⌂○ □∆ ⌂□ ∆□○

• ⌂ ○∆ ⌂ □ □∆ ○○□

• ∆ ⌂ □ □ □ ⌂ ⌂○ □

Shapes Tally frequency

Circle IIII IIII 9

pentagon IIII IIII 10

Square IIII IIII I 11

Triangle IIII IIII 10

EXAMPLE:

Total 40

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Now your turn!!!Now your turn!!!

• The salary of 24 people in my neighborhood (in $ thousands):

• 25 26 30 25 26 28 28 28

28 25 25 30 30 25 30 30

28 25 30 27 30 29 29 28

Using tally marks, make a frequency distribution table.

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More ProblemsMore Problems

• The following table shows the number of TV’s sold by a shopkeeper during a week. Prepare a frequency table.

Friday

Thursday

Wednesday

Tuesday

Monday

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LINE GRAPHSLINE GRAPHS

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Line GraphsLine Graphs

• A line graph uses a series of line segment to show changes in data.

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Making a Line graphMaking a Line graphTemperatures through

out the day

Time Temperature

8 A.M 50 F

10 A.M 60 F

12 P.M 70 F

2 P.M 80 F

4 P.M 75 F

6 P.M 60 F

8 P.M 55 FTIME OF DAY

8 AM 10AM 12PM 2 PM 4 PM 8 PM6 PM

50

55

60

65

70

75

80TEMPERATURE

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More ExamplesMore ExamplesConvert the frequency table into a line graph:

Fruit Numbers

Apple 9

Orange 4

Mango 15

Pear 13

Fruits

Apple Orange Mango Pear

5

7

9

11

13

15N

U

M

B

E

R

S

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Solve the puzzleSolve the puzzle

http://www.thekidzpage.com/onlinejigsawpuzzles/kids-jigsaw-puzzles/12-piece-jigsaw/12-27-06-puppydog.html

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Time for a break!Time for a break!

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Now your turnNow your turn

Snack Numbers

Sandwich 15

Chips 26

Samosa 15

Cake 7

Convert the given frequency table into line graph

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More practice problemsMore practice problems

• Prepare a frequency table and then draw a line graph with this observations:

145, 150, 142, 144, 147, 150, 148,147,149,151, 149, 144, 150, 146,148,150,149,144, 151, 148,147,146, 151,149,150,140,146,147,150,151.

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AssignmentAssignment

• The following table gives birth-days of 40 boys in a class. Illustrate the data by a line graph.

Days sunday monday Tuesday Wednesday Thursday Friday Saturday

Number of boys

6 7 3 8 11 3 2

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ReviewReview

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

• A line graph uses a series of line segments to show changes in data.

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That’s all for today!!!That’s all for today!!!

You did a good job!