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Data Handling Class 7 Notes CBSE Maths Chapter 3

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Last updated date: 27th Mar 2024
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MVSAT 2024

Revision Notes for CBSE Class 7 Maths Chapter 3 - Free PDF Download

Class 7 Maths Chapter 3 Data handling is a chapter that deals with processes by which we can work on data and store them in various formats. It is an important chapter as per the CBSE board as it teaches us about the study of data from different fields.


Students can download Class 7 Maths NCERT Solutions to revise the complete syllabus and score more marks in the examinations.


Topics Covered in Data Handling Class 7 CBSE Maths Chapter 3 

Students of Class 7 can take note of the following topics that have been discussed in Chapter 3 Data Handling and ensure that they have covered them while preparing and revision.

  • Introduction to Data Handling

  • Collecting Data

  • Organisation of Data

  • Representation Values

  • Arithmetic Mean 

  • Range

  • Mode

  • Median

  • Use of Bar Graph with Different Purposes

  • Chance and Probability


Download CBSE Class 7 Maths Revision Notes 2023-24 PDF

Also, check CBSE Class 7 Maths revision notes for All chapters:


Access Class 7 Maths Chapter 3 - Data Handling Notes

  • Data collection, recording, and presentation assist us in organising and concluding from our experiences.

  • We need to know what we are going to do with the data before we start collecting it. The information gathered should be organised in a table that is easy to grasp and analyse.

  • The average of a set of numbers can be calculated by finding the sum of the numbers divided by the total numbers of values $\left( n \right)$ in the set. 

  • The mean, median and mode of a data set are collectively known as measures of central tendency.  

  • One of the representative values of data is the arithmetic mean.\[\text{Mean = }\dfrac{\text{sum of all observations}}{\text{number of all observations}}\]

  • Another type of central tendency or representative value is mode. The most common observation in a group of observations is called the mode. If each value in a data set occurs only once, then all of the values are in mode.

  • We sometimes refer to this data as having no mode because none of them occurs frequently.

  • The median is a type of representative value as well. It's the value in the middle of the data set, with half of the observations above it and the other half below it.

\[\text{Median = }\dfrac{1}{2}\left[ \dfrac{\text{n}}{\text{2}}\text{th observation + }\left( \dfrac{\text{n}}{\text{2}}+1 \right)\text{th observation} \right]\].

  • A bar graph is a visual representation of numbers made up of uniformly sized bars. Double bar graphs make it easy to compare two sets of data at once.

  • Double bar graphs make it easy to compare two sets of data at once. In our lives, there are events that are certain to occur, some that are impossible to occur, and still others that may or may not occur.

  • The situation, which may or may not occur, has a possibility to occur.

  • Probability is an area of mathematics that may be used to calculate the probability of an event occurring (in percentage terms). If you have ten likelihoods and want to determine the probability of one event occurring, you might say that the probability is $\dfrac{1}{10}$or the event has a $10\%$ chance of occurring.

  • Events with multiple possibilities can have a probability ranging from $0$ to $1.$.


Key Takeaways from Revision Notes of Data Handling Class 7 CBSE Maths Chapter 3 

This chapter builds more calculative and imaginative power inside your mind and plays an important role from the exam point of view. Every year in the Class 7th CBSE exam one to two questions come from this chapter only. 


Notes On Data Handling

1. Double Bar Graph:

The double bar graph is considered as an effective tool to compare different values of two quantities having the same observation. For example, marks scored by 6 students of the same class in subject maths and science. From this data, we can analyze the performance of each student. 

2. Averages:

The formula for arithmetic mean and range:

Mean = Sum of all observations/number of observations

3. Median:

When we arrange the provided data into ascending order or descending order, then the middlemost observation is termed as the median of that given data. 

Example: Number of apples different person have: 10, 15, 20, 30, 25, 40, 35

Observation in ascending order: 10, 15, 20, 25, 30, 35, 40

The median value of the given term is: 25 (as 25 is the middlemost term) 

4. Mode:

The term which gets repeated most of the time in a given observation is termed as a mode.

Example: Given set of number is 2,2,2,9,9,6,7,5

The mode of the sequence is 2 ( as 2 is repeating most of the time)

5. Probability:

The chance of occurring any particular event is known as its probability. 

A number of outcomes or Sample Space  The set of all the possible outcomes to occur in any experiment is known as sample space.

Examples: Experiment : Tossing a coin, Sample Space (S) = {H,T}


Features of NCERT Data Handling Class 7 CBSE Maths Chapter 3 Revision Notes

Revision Notes on the Maths chapter of Data Handling are provided here for the students of Class 7 so that they can understand and revise the chapter in a full-fledged manner. Now let us check what are the benefits of the revision notes.

  • In our revision notes, we cover all important topics as per CBSE point of view. 

  • From these revision notes, you can cover all the important topics of a particular subject within an hour. 

  • Along with FAQS, these revision notes also consists of several multiple-choice questions which will help you in practicing more and more questions. The more you practice the more you get command in that subject. 

  • Vedantu also provides you revision notes of each particular chapter in a very easy way from where you can target each chapter of maths as each subject has its own important role in different exams. 

  • Top subject experts of Vedantu are there to prepare the best revision notes for you so that you can give your best in the examination. 

  • We provide notes which have neat and clear diagrams with proper descriptions and content which will help you from a broad point of view. 


Check the links given below for more information about each chapter given in the class 7 maths syllabus and you can also download chapter-wise revision notes of each subject along with solved MCQ questions and answer writing questions from here you will learn answer framing ability also. So download class 7 CBSE maths Revision Notes in PDF format from the Vedantu site or app.


Chapter-wise Revision Notes for Class 7 Maths


Also Access, 


Benefits of Studying the Revision Notes for Data Handling Class 7 CBSE Maths Chapter 3 

CBSE Class 7 Maths Chapter 3 - Data Handling Revision Notes provided by Vedantu will help students ace their exam preparation as they will be able to go through all the important points and concepts related to the Class 7 Maths Chapter 2 topics in a concise manner. 

  • These notes are available in downloadable PDF format. Hence, students can revise the chapter anytime and anywhere when they feel the need to glance over the chapter or before sitting for the exam.

  • These revision notes ensure quicker revision and better retention of key concepts and topics. Therefore, the revision time will be considerably reduced and students will also be able to dedicate more time to question solving as well.


This was the complete discussion of the CBSE Class 7 Maths Chapter 3 - Data Handling Revision Notes. We have provided an easy and concise explanation of all the topics covered in the chapter. Download the CBSE Class 7 Maths Chapter 3 - Data Handling Revision Notes free PDF to ace your preparations. We hope to have helped you with all your queries. 


We wish you all the very best for the upcoming examinations!

FAQs on Data Handling Class 7 Notes CBSE Maths Chapter 3

1. What All Strategies are Needed While Studying Maths?

While studying maths you all need to be very attentive and focused as biology as a subject is full of concepts and numerical and each part is equally important as the exam point of view. So memorizing all these concepts is not an easy task, it needs regular revision. So, that you can understand and learn each topic thoroughly. One who wants to score good marks in biology needs to work hard and do constant study.

2. How Vedantu Notes are Important from an Exam Preparation Point of View?

Vedantu always considers their students as their family and for them, they put all their efforts. Our top educators who are specialized in their respective fields, prepare the best revision notes for their students.  In our revision notes, we cover all important topics as per the board and competitive exams point of view. 


From these revision notes, you can cover all the important topics of a particular subject within an hour. These revision notes also our frequently asked questions along with several multiple-choice questions which will help you in practicing more and more questions.

3. List all the topics covered in Chapter 3 of Maths in Class 7.

Class 7 Maths Chapter 3 introduces students to data organization and related statistics. The chapter also introduces several new concepts such as probability which are a prominent part of the syllabus in higher standards. List of topics covered by the prescribed textbook to explain these new concepts are Collection of Data,  Organisation of Data, Arithmetic Mean, Mode, Mode of Large Data, Median, Use of Bar Graphs with a Different Purpose, Chance and Probability. Students should pay special attention to these topics for examinations.

4. Where can I find notes for the theory part of Chapter 3?

The theory section of Chapter 3 is as important as the numerical section of this chapter. There are new terms and concepts explained in the chapter which can be confusing as these terms are closely related. Class 7 Maths Chapter 3 Revision Notes contains all the topics of this chapter. You can find notes about all the topics mentioned in the Class 7 Maths NCERT book. To download these notes, you can visit Vedantu’s website. The notes are free of cost and also available on Vedantu Mobile app.

5. What is a median according to Class 7 Maths Chapter 3?

When random data is organized in ascending order i.e. from the smallest number to the largest number, then the middlemost observation of the data assembled is termed as the median of that given data.

For example, a random collection of data about mangoes is 10, 15, 20, 30, 25, 40, 35.

Reorganizing the data of mangoes in ascending order - 10, 15, 20, 25, 30, 35, 40.

Therefore, the middlemost term in this observation is 25, which is the median of mangoes.

6. Is Chapter 3 important from an examination point of view?

The chapter briefs students about the organization of a variety of data. This skill of organization of data is an important skill when it comes to the corporate world. The concept of organizing data is used in almost all fields of work. Thus, it is important to pay attention to the concepts of this chapter. The chapter is also necessary from the examination point of view as the chapter consists of a good amount of theory as well as numerical.

7. How many questions are there to practice in Chapter 3?

Chapter 3 follows the familiar pattern of NCERT books and comprises four exercises that are within the chapter. The total number of questions, combining all the questions of the four exercises, is 28, followed by sub-questions. Exercise 3.1 comprises nine questions, Exercise 3.2 comprises five questions with sub-questions, Exercise 3.3 consists of 5 questions with sub-questions, and Exercise 3.4 comprises nine questions that are based on the concepts of data handling.