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ICSE Class 9 Mathematics Revision Notes Chapter 19 - Mean and Median

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Revision Notes for ICSE Class 9 Mathematics Chapter 19 - Free PDF Download

“Not everyone who takes extra paper during exams writes extra sense.”

Ernest Agyemang Yeboah


Here at Vedantu, our experienced teachers make sure you get a better understanding and knowledge in the most simply put well-written Short Keynotes that are available for free to save you the trouble of examination stress. The revision notes for Class 9 Maths Chapter 19 - Mean and Median (For Ungrouped Data only) are as per the latest CISCE guidelines to bring you the best of grades.

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ICSE Class 9 - Chapter 19 - Mean and Median

The first section begins with the students’ learning about what Mean is and how to calculate it for ungrouped data. On moving forward the students get to dig deeper and study the properties of Mean and how it is affected by any number namely (this can be any number and can increase or decrease the Mean depending on how it is being used). This concludes the end of the first half of the chapter.


For the second section, the students study the median, which can be defined as the middle value for any given collection of data, and the steps involved to find the median of any ungrouped data. It is done in three steps and the third step differs when the number of observations is odd and when they are even. Therefore, students must keep it in mind when calculating the median.


Mean and Median

The notes can be easily downloaded from Vedantu’s website or app to utilize them. You can study them in offline mode too. This saves a lot of time and effort the students have to waste just to prepare the right notes. The revision notes for Chapter 19 Maths class 9 also come with varied questions to hone your skills.

FAQs on ICSE Class 9 Mathematics Revision Notes Chapter 19 - Mean and Median

1. Following the concept in Chapter 10 of ICSE Maths, how can we calculate the Median of {3; 14; 86; 2; 67; 19; 29; 1}?

 In order to calculate the median we need to follow up through two steps, which are as follows:

Step 1: Arranging them in ascending order we get,

                                 1,2,3,14,19,29,67,86.

Step 2: Since the total number of observations is even, we know that the median will be midway between the two numbers in the middle. So we add the numbers in the middle and divide them by 2.

                                                 I.e., \[\frac{14+19}{2}\] = 16.5

Thus, 16.5 is the median.

2. How many Exercises are in Chapter 19 of Class 9 Maths?

Mean and Median contain 3 exercises namely 19(A), 19(B), and 19(C) with 16 questions in the first exercise, 5 questions in the second, and 14 questions in the third one. It is extremely important to practice these questions time and again along with the question bank available at Vedantu, so the students can understand the whole chapter thoroughly making their concepts clear as a day and making sure they get excellent marks which is the goal of us at Vedantu. 

3. From where can I download the best and accurate Revision and Practice Material for Class 9 of the ICSE Board for free?

9th standard students can feel stressed at times due to the pressure of approaching boards in a year, thus, Vedantu’s your lifesaver for unproblematic fast PDF downloads for free. These PDFs are specially curated by our learned teachers to make you better at every subject in every possible way through their solved questions, to the point definitions and notes for class 9 ICSE and so much more made from all across India to your home and to you through just a click!

4. Where in our daily lives do we use Statistics included in Chapter 19 of Class 9 Maths?

Statistics are used everywhere in our lives from medical fields (for example- doctors tracking the development of a baby’s brain) or the weather forecast predictions and to the rise and low in the stock market or its analysis. If we are talking about subtopics in statistics such as the median is used to calculate the average of inconsistently divided data. For example, if we wish to calculate the average salary of people in a city, we can use the median.

5. Following the concept in Chapter 10 of ICSE Maths, how can we calculate the Mean of the numbers 5,8,9,10,13,15?

We wish to calculate the mean of the following numbers: 5,8,9,10,13,15


Step 1: To calculate the mean of these the first step is to note the total number of observations present(n): 6


Step 2: Then we calculate the sum of the numbers given, so we get: 5+8+9+10+13+15= 60


Step 3: We divide the values obtained, such that:

60/6 = 10

So the Mean obtained is 10.