Table of contents  
Data  
Recording Data  
Organization of Data  
Pictograph  
Drawing a Pictograph  
Bar Graph  
Drawing a Bar Graph 
Data is a collection of raw facts and figures that give you information.
For Example: If we have to compare the choice of the people about certain movies then we have to collect the data of the survey which tells the choice of the people about those movies.
Example: There are 30 students in a class. They have to choose one sport each for the sports period.5 took badminton, 10 took cricket, 4 took football, 1 took hockey, 3 took tennis and 7 went for volleyball. Represent this data in the frequency distribution table.
Solution: To make a frequency distribution table
If we represent the data with the pictures of objects instead of numbers then it is called Pictograph. Pictures make it easy to understand the data and answer the questions related to it by just seeing it.
We can easily answer the questions like who has a maximum number of toys, who has the least number of toys etc.
Drawing a pictograph is an interesting task but it may be difficult to draw some difficult pictures repeatedly as we had used cars in the above example so we can use easy symbols to draw a pictograph. We must use a proper key of the symbols so that it could be easily understood by anyone.
Example: The following table shows the choice of the fruits of the 35 students of class 3.represent the data in a pictograph.
Name of Fruit  Number of Students 
Mango  5 
Apple  12 
Guava  3 
Litchi  7 
Grapes  8 
Solution:
As the pictograph is a very timeconsuming process, so we can use another way to represent data. If we use the bars of the same width with equal spacing to represent the data in which the length of the bars represent the frequency is called Bar Graph or Bar Diagram.
Example: The following graph tells the favourite colours in a class of 30 students.
Answer the following questions:
Solution: The graph shows that the pink colour is liked by 9 students so it is the favourite colour of the maximum number of students. Blue and green colour bars are equal in length and both are liked by 6 students.
Drawing a bar graph is an interesting task, but we must choose an appropriate scale to draw the bar graph. It depends upon our own choice that what we are taking for the scale.
Example: The daily sale of mobile phones in Vicky production is given below. Draw the bar graph to represent the data.
Solution: Steps to make a bar graph
The height of the bars tells the sale of the mobile phones in Vicky production.
This same bar graph can be made by interchanging the positions of the days and the number of phones.
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