Class 4 Exam > Class 4 Notes > Mathematics for Class 4 > Chapter Notes: Data Handling
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 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.
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.
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.
Use 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
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FAQs on Data Handling Class 4 Notes Maths
| 1. What is a bar graph? |  |
Ans. A bar graph is a visual representation of data using rectangular bars. The length or height of each bar corresponds to the quantity or value it represents. It is commonly used to compare and display different categories of data.
| 2. How can bar graphs be used in data handling? | |
Ans. Bar graphs are an effective way to represent and analyze data. They can be used to show the frequency or quantity of different categories, compare data sets, identify trends, and make predictions based on the data. They help in understanding and interpreting complex information easily.
| 3. What are the key components of a bar graph? | |
Ans. The key components of a bar graph include the x-axis (horizontal axis) representing the different categories or groups, the y-axis (vertical axis) representing the values or quantities, bars of varying lengths or heights corresponding to each category, and a title that describes the data being represented.
| 4. What are some advantages of using bar graphs? | |
Ans. Bar graphs have several advantages. They provide a clear visual representation of data, making it easier to understand and interpret. They allow for easy comparisons between different categories or groups. Bar graphs are also flexible and can accommodate large amounts of data. Additionally, they can be easily created and understood by a wide range of audiences.
| 5. Can bar graphs be used for qualitative data? | |
Ans. Yes, bar graphs can be used to represent qualitative data. In this case, the categories on the x-axis represent different qualitative variables, and the length or height of the bars represents the frequency or count of each category. Bar graphs are versatile and can effectively represent both qualitative and quantitative data.
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