We consider Multiple or Grouped Bar diagrams to compare related series. Component or sub-divided Bar diagrams are applied for representing data divided into a number of components. Finally, we use Divided Bar charts or Percentage

Bar diagrams for comparing different components of a variable and also the relating of the components to the whole. For this situation, we may also use Pie chart or Pie diagram or circle diagram.

## Reading bar graphs - Examples

Example 1 :

The total number of runs scored by few players in one-day match is given in the bar graph.

Question :

Which player did score the maximum runs ?

When read the above bar graph, it is clear that player no.5 scored the maximum runs. That is 70.

Question :

What is the ratio between the runs scores by player 2 and player 5 ?

Player 2 : Player 5  =  60 : 70  =  6 : 7

Question :

What is the difference between the runs scored by player 1 and 4 ?

Difference  =  |60 - 50|  =  10

Question :

What percentage of runs did player 5 score more than player 4 ?

Difference between the runs scored by player 4 and 5 is

=  70 - 50

=  20

Required percentage  =  (20/50) x 100 %

=  40 %

Example 2 :

The number of students in each class of a school is given in the bar graph.

Question :

In which class, is the student strength maximum ?

When read the above bar graph, it is clear that the class 6 has the maximum strength. That is 450.

Question :

What is the ratio between the strengths of class 9 and class 10 ?

Class 9 : Class 10  =  400 : 350  =  8 : 7

Question :

What is the difference between the strengths in class 8 and class 10 ?

Difference  =  |425 - 350|  =  75

Question :

What percentage of strength does class 6 have more than class 7 ?

Difference between the strengths in class 6 and class 7 is

=  450 - 400

=  50

Required percentage  =  (50/400) x 100 %

=  12.5 %

Example 3 :

The average temperature during the month of April in a city during the year 2007 to 2012 is given. Draw bar graph for the data.

Solution :

After having gone through the stuff given above, we hope that the students would have understood "How to read bar graphs".

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