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
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