L10 : Bar Graph Interpretation - Data Handling, Mathematics, CBSE Class 6 Video Lecture

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let us take one more example let's say
that you are organizing a trip and the
trip involves lot of costs so you have
your food expenses your transport
expenses sting and hotel expenses
shopping expenses in etc so you want a
bar graph to represent all of these data
so here it shows the various events like
transport stale food and shopping and
their respective expenses in rupees so
what do we do so on the graph paper we
first choose a horizontal axis and a
vertical axis so let's say this is a
vertical axis and this is a horizontal
axis right so this time let us try to
draw horizontal bars so for that what we
will do let's represent the trip the
events on the y axis and let's represent
the numbers that is the expenses on the
x axis so our first step is done our
next step is to choose a scale so we
will have to decide a scale for the x
axis so what should be our scale let's
look at the range the range is from 1000
to 4000 so basically it is in thousands
so we cannot consider scale as one unit
as ten because here we are dealing with
thousands so what should be considered
so in this case let us assume that one
unit represents rupees thousand that
means one square would represent so from
here to here this 1 square is
representing one thousand so let's see
if this is zero this is one thousand
this is two thousand this is three
thousand this is four thousand
and so on so this is one good option to
locate these right so for the first
event is transport so for transport the
expenses are four thousand so let's see
we draw a graph like this till four
thousand that means still here so the
height of the graph so this in this case
the height is not exactly height but the
length because we are drawing horizontal
bars so this would be for transport what
would be our next bar next bar would be
for steel which is two thousand so let's
say we draw this here so next one is
stay that is two thousand so this bar
represents steel the third bar is for
food which is one thousand so one
thousand is here so this represents food
and the fourth one is shopping which is
1500 so 1500 would be exactly midway
between thousand and two thousand that
means two boxes this side two boxes this
size the side and half boxes in between
so this would be one thousand plus two
and a half boxes right so that would be
somewhere till here so if you draw it
like this so this would be for shopping
so in this fashion you can draw a bar
graph in this time we have drawn
horizontal bars so that's what I was
standing right depending on what we want
to draw whether we want to draw
horizontal bars or vertical bars and how
many units or how do you choose the
scheme that is clear right so once you
have chosen the scale then how do you
choose these values so that's very
simple for example for transport how
many units it will cover so that will
depend on this 4000 is what you want to
represent and you have assumed that one
unit is 1000 so divide it by
thousand so what do you get you get four
that means this would cover four units
and you see that is what you did one two
three and four so it covered four units
when you talk about state it represents
2000 so 2000 divided by thousand that is
2 so this would cover two units so you
see it has covered two units one and two
so two squares
similarly for food it was 1,000 so it
covered one unit because one thousand
divided by 1,000
what about shopping for shopping it was
1,500 divided by 1000 which was 1.5 that
is one and a half and that is what you
did so one full square and then half
square so in this fashion you need to
decide or if this is how you need to
draw the length of the bar or height of
the bar and that's how you get a bar
graph so the most important and critical
part of drawing a bar graph is to choose
the scale interpreting a bar graph is
pretty simple let's say you are given
this bar graph so looking at this bar
graph if I ask you whose whose code
maximum so just by looking at the height
of the bar graph you can tell that Ranas
code maximum if I ask you whose code
minimum so the bar which has the least
height so we can see that rei'kas code
minimum so if I ask you how many of them
who owns hold marks more than 30 so
there is 30 30 is somewhere here
somewhere at this level so all the bars
which goes beyond 30 they all scored
more than 30 that means Akash
Amit and Rana they all scored above 30
so in this fashion you can very easily
interpret information from a bar graph
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