Data Handling Class 7 Notes CBSE Maths Chapter 3

• 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.

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!

Related Study Materials for Class 7 Maths Chapter 3 Data Handling

Chapter-wise Links for Class 7 Maths Notes

Important Study Materials for Class 7 Maths