6-3&6-4: BAR GRAPHS, FREQUENCY TABLES AND LINE PLOTS

BAR GRAPH

What is a bar graph? A bar graph is used to compare and display

data in vertical or horizontal bars.

Example:

Sava

nnah

Rainf

ores

t

Decid

ulou

s fo

rest

Tund

ra0

60

120

Average Yearly Rainfall

Inch

es

Biomes

Sava

nnah

Rainf

ores

t

Decid

ulou

s fo

rest

Tund

ra0

60

120

Average Yearly Rainfall

1. Which biome has the highest yearly rainfall?Rainforest

2. Which biome has the least amount of rainfall?Tundra

3. Approximate the range of the rainfall data for the biomes.

150-25= 125

Reading a Bar Graph

Biomes

Inch

es

CREATE A BAR GRAPH TO MODEL THE GIVEN DATA

Coal Reserves (Billion metric tons)

Asia Europe

Africa

695 404 66

Asia Europe Africa0

100200300400500600700800

Coal Reserves

Bill

ion

Metr

ic t

on

s

Continent

DOUBLE BAR GRAPHLife Expectancies in Atlantic South America

Brazil Argentina Uruguay Paraguay

Male (yr) 59 71 73 70

Female (yr) 69 79 79 74

Brazil ArgentinaUruguay Paraguay0

102030405060708090

Life Expectancies in Atlantic South America

MaleFemaleY

ears

Countries

FREQUENCY TABLES

What does the word frequency mean? Frequency refers to how many times a specific

value occurs in a data set.

What is a frequency table? A frequency table lists items together according

to their frequency in the data sets

EXAMPLE OF A FREQUENCY TABLE Using tally marks: Each student in Mrs. Chloe’s class recorded

their fingerprint pattern. Which type is most common in Mrs. Chloe’s class?

Whorl Loop Loop Loop Loop Arch LoopWhorl Arch Loop Arch Loop Whorl Arch

Fingerprint Patterns

Pattern Tallies Frequency

Whorl III 3

Loop IIIII II 7

Arch IIII 4

MAKING A FREQUENCY CHART WITH INTERVALS

Number of Representatives per State in the U.S. House of Representatives

7 1 6 4 52 6 6 1 1 23 11 2 2

20 10 5 4 6 7 2 8 10 16 8 5 9

1 3 2 2 13 3 31 12 1 19 6 5 21

2 6 1 9 30 3 1 11 9 3 9

First step is to decide what you intervals should be. Find the smallest numberand the largest number.

Number of Representatives per State in the U.S. House of Representatives

Number 0-5 6-11 12-17

18-23

24-29

30-35

36-41

42-47

48-53

Frequency 22 18 3 4 0 2 0 0 1

LINE PLOTS What is a line plot?

A line plot uses a number line and x’s to show frequencies of values.

Example:Students in Mr. Lee’s class, each ran several miles in a week. Create a line plot of the data.

Number of miles run

8 3 5 6 7 8 5 5 3 6 10 7 5

3 4 5 6 7 8 9 10

X X X X X X X X X X X X X