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Data Handling Class 4 Notes Maths

Bar Graphs

Pictographs require a lot of skill in drawing clear pictures. Also, representing large numbers by pictographs becomes difficult. So, easier methods of presenting data pictorically have been devised. One such method is drawing a Bar Graph.
A bar graph can be represented in two ways shown below.
Title: Tickets sold for a play by 5 studentsTitle: Tickets sold for a play by 5 students

From the above graphs, we see that,

  • Information is represented along the two axes, horizontal and vertical.
  • Each axis must have labels to explain as to what information is being represented. 
  • Bars are drawn to represent the desired number.
  • Every graph must have a title.

Data Handling Class 4 Notes Maths

In the first bar graph, the names of the students are given along the horizontal line.
The vertical line is a number line showing the number of tickets.
In the second bar graph, these two lines are interchanged. The names of the students are given along the vertical line and the number of tickets along the horizontal line.
The length of each segment on the number line, the width of the bars and the space between the bars are fully your choice. You may choose these such that they may fit the space you have. 

Example 1: Make a tally chart to show favourite food choices of students of     Class IV. Then, draw a bar graph to show this.
Data Handling Class 4 Notes Maths

Data Handling Class 4 Notes Maths
Data Handling Class 4 Notes Maths
As is clear from the above bar graph, the names of food choices are along the horizontal axis and the number of students along the vertical axis.
The width of the bars and the distance between them should be kept the same.

Interpreting/Reading Bar Graph

Bar graphs help you to find out detailed information about a given data. Here, you will learn how to read a bar graph.
Look at the following example. 

Example 2: A group of students measured and recorded their weights and drew a bar graph on the data collected.
Data Handling Class 4 Notes MathsUse the bar graph given above to answer the following.
(a) Who is the heaviest of all? What is the maximum weight?
(b) Who has the lowest weight in the group? What is the lowest weight?
(c) Did any of the students have the same weight? Who were they and how much did they weigh?
(d) What is represented by each square on the horizontal line?

(a) Subodh; 85 kg
(b) Rupa; 55 kg
(c) Yes; Rakhi and Ravi; 70 kg
(d) 5 kg

The document Data Handling Class 4 Notes Maths is a part of the Class 4 Course Mathematics for Class 4.
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FAQs on Data Handling Class 4 Notes Maths

1. What is a bar graph and how is it used in data handling?
Ans. A bar graph is a visual representation of data using rectangular bars where the length of each bar is proportional to the value it represents. Bar graphs are used in data handling to compare different categories or groups, making it easy to see trends and differences in data at a glance.
2. How do you create a bar graph from a given set of data?
Ans. To create a bar graph, first, collect the data you want to represent. Next, identify the categories for the x-axis and the values for the y-axis. Then, draw a vertical or horizontal axis, label the axes, and plot the bars corresponding to each category's value. Finally, ensure to add a title to your graph for clarity.
3. What are the different types of bar graphs?
Ans. There are mainly two types of bar graphs: vertical and horizontal. Vertical bar graphs display bars that extend upwards, while horizontal bar graphs display bars that extend sideways. Additionally, there are grouped bar graphs, which compare multiple categories side by side, and stacked bar graphs, which show the total value broken down by subcategories.
4. What are the advantages of using bar graphs for data representation?
Ans. Bar graphs provide a clear visual comparison between different categories, making it easier to identify trends and patterns. They are simple to understand, can handle large sets of data, and can represent both discrete and continuous data. Bar graphs also allow for easy comparison of multiple datasets when grouped or stacked.
5. How can one interpret data from a bar graph effectively?
Ans. To interpret data from a bar graph, start by examining the labels on both the x-axis and y-axis to understand what each bar represents. Look at the height or length of each bar to determine the value it corresponds to. Additionally, compare the bars to see which categories have higher or lower values and look for patterns, such as trends over time or differences between groups.
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