CBSE Class 9 > Class 9 Videos > Reading bar graphs
Reading bar graphs Video Lecture - Class 9
FAQs on Reading bar graphs
| 1. What is a bar graph? |  |
A bar graph is a visual representation of data using rectangular bars of different lengths or heights. The length or height of each bar represents the quantity or value of a specific category or variable being measured.
| 2. How are bar graphs useful? | |
Bar graphs are useful because they provide a clear and concise way to present and compare data. They make it easy to identify trends, patterns, and relationships between different categories or variables. Bar graphs are commonly used to display data in various fields such as business, economics, education, and research.
| 3. How do you read a bar graph? | |
To read a bar graph, start by identifying the categories or variables represented on the x-axis (horizontal axis) and the values or quantities represented on the y-axis (vertical axis). Then, examine the height or length of each bar to determine its value or quantity. The taller or longer the bar, the higher the value or quantity it represents. Additionally, pay attention to the labels, titles, and scales provided on the graph to properly interpret the data.
| 4. What are the different types of bar graphs? | |
There are several types of bar graphs, including vertical bar graphs, horizontal bar graphs, stacked bar graphs, and grouped bar graphs. Vertical bar graphs display the categories or variables on the x-axis and the values or quantities on the y-axis. Horizontal bar graphs, on the other hand, have the categories or variables on the y-axis and the values or quantities on the x-axis. Stacked bar graphs show the composition of multiple variables within each category, while grouped bar graphs compare different categories side by side.
| 5. How can bar graphs be misleading? | |
Bar graphs can be misleading if they are manipulated or presented in a way that distorts the data. Some common ways that bar graphs can be misleading include altering the scale of the y-axis, using different bar widths, omitting certain categories or data points, and selectively choosing the range of data displayed. It is important to critically analyze and interpret bar graphs to ensure they accurately represent the data being presented.
Text Transcript from Video
Based on the data below,
which student's score improved
the most between the
midterm and final exams?
And so they give us
this data in terms
of a bar graph for each student.
We actually have two bars
that show the midterm in blue
and then the final exam in red.
And they tell us that here--
midterm in blue and final exam.
And sometimes this is called
a two-column bar graph
because for each student here
you have two columns of data.
So if you were to actually
look at the data itself,
you have the midterm
data and then
you have the final exam data.
Now, they're asking us which
student's score improved
the most between the
midterms and the final exams?
So if we look at
Jasmine right over here,
might as well start
with her since she's
the most to the left.
It looks like she definitely
did improve from the midterm
to the final.
It looks like in the
midterm, if I had to guess,
this looks like about
a, I don't know,
it looks like she got
maybe about a 72 or 73
on the midterm.
I'm just guessing because I
don't know the exact number.
And then it looks like on the
final she got, I don't know,
that looks like maybe a
77 or 78 approximately.
So she improved a little
bit, about five points
from the midterm to the final.
The way that they've
given us this information,
we don't know the exact
numbers because it's not
super precise in terms
of marking off the bars,
but hopefully it'll
become obvious
when we look through
everyone's scores.
Let's look at Jeff.
So Jeff actually did worse from
the midterm to the final exam.
He got looks like over
an 85 on the midterm
and then on the final he
got about 84 or an 85.
So he actually went down.
So it's definitely not Jeff.
He definitely did
not improve the most.
He actually went down.
Next, if you think
about Nevin, it
looks like Nevin actually
improved about the same amount
as Jasmine.
On both scores, I don't know if
Nevin is a boy or girl's name,
this person on both tests, this
person did better than Jasmine,
but it looks like the actual
improvement is about the same.
Looks like they went from
about 83 to, I don't know,
about an 88.
I'm just estimating
it, just trying
to look at this axis
right over there
and estimating what
those scores are.
So Nevin and Jasmine right now,
based on the three we've seen,
are tied for the lead.
Now let's look at Alejandra.
Now Alejandra-- OK,
so this jumps out.
She definitely improved
dramatically from the midterm
to the final exam.
It looks like on the midterm
she maybe got an 81 or an 82.
So maybe this was an 82
she got on the midterm,
and then on the final, it
looks she got about a 95
on the final.
So there's dramatic improvement.
So right now Alejandra
is the leading contender
for most improved from
the midterm to the final.
And then finally
Marta, right over here,
it looks like she actually
got worse from the midterm
to the final.
She scored in the mid-90s
in the midterm and then low
90s in the final.
So she's definitely
not the most improved.
So the winner here is Alejandra.
Alejandra is the most
improved between the midterm
and the final exam.
which student's score improved
the most between the
midterm and final exams?
And so they give us
this data in terms
of a bar graph for each student.
We actually have two bars
that show the midterm in blue
and then the final exam in red.
And they tell us that here--
midterm in blue and final exam.
And sometimes this is called
a two-column bar graph
because for each student here
you have two columns of data.
So if you were to actually
look at the data itself,
you have the midterm
data and then
you have the final exam data.
Now, they're asking us which
student's score improved
the most between the
midterms and the final exams?
So if we look at
Jasmine right over here,
might as well start
with her since she's
the most to the left.
It looks like she definitely
did improve from the midterm
to the final.
It looks like in the
midterm, if I had to guess,
this looks like about
a, I don't know,
it looks like she got
maybe about a 72 or 73
on the midterm.
I'm just guessing because I
don't know the exact number.
And then it looks like on the
final she got, I don't know,
that looks like maybe a
77 or 78 approximately.
So she improved a little
bit, about five points
from the midterm to the final.
The way that they've
given us this information,
we don't know the exact
numbers because it's not
super precise in terms
of marking off the bars,
but hopefully it'll
become obvious
when we look through
everyone's scores.
Let's look at Jeff.
So Jeff actually did worse from
the midterm to the final exam.
He got looks like over
an 85 on the midterm
and then on the final he
got about 84 or an 85.
So he actually went down.
So it's definitely not Jeff.
He definitely did
not improve the most.
He actually went down.
Next, if you think
about Nevin, it
looks like Nevin actually
improved about the same amount
as Jasmine.
On both scores, I don't know if
Nevin is a boy or girl's name,
this person on both tests, this
person did better than Jasmine,
but it looks like the actual
improvement is about the same.
Looks like they went from
about 83 to, I don't know,
about an 88.
I'm just estimating
it, just trying
to look at this axis
right over there
and estimating what
those scores are.
So Nevin and Jasmine right now,
based on the three we've seen,
are tied for the lead.
Now let's look at Alejandra.
Now Alejandra-- OK,
so this jumps out.
She definitely improved
dramatically from the midterm
to the final exam.
It looks like on the midterm
she maybe got an 81 or an 82.
So maybe this was an 82
she got on the midterm,
and then on the final, it
looks she got about a 95
on the final.
So there's dramatic improvement.
So right now Alejandra
is the leading contender
for most improved from
the midterm to the final.
And then finally
Marta, right over here,
it looks like she actually
got worse from the midterm
to the final.
She scored in the mid-90s
in the midterm and then low
90s in the final.
So she's definitely
not the most improved.
So the winner here is Alejandra.
Alejandra is the most
improved between the midterm
and the final exam.
About this Video
Apr 19, 2026 Last updated
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