RS Aggarwal Solutions Class 7 Maths Chapter 21 Ex 21.1 (Updated For 2024)

RS Aggarwal Solutions Class 7 Maths Chapter 21 Ex 21.1: Be it your Class 7 Maths exam preparation or the class assignments, RS Aggarwal Solutions Class 7 Maths has got your back. Subject matter experts have designed well-explained solutions of RS Aggarwal Solutions Class 7 Maths Chapter 21 Ex 21.1 for your better understanding. The solutions are accurate, credible, and as per the current CBSE Syllabus.

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Question 1.
Solution:
(i) Data : A collection of numerical figures giving some particular type of information is called data
(ii) Raw data : Data obtained in the original form is called raw data.
(iii) Array : Arranging the numerical figures of a data in ascending or descending order is called an array.
(iv) Tabulation of data : Arranging the data in a systematic form in the form of a table is called tabulation of the data.
(v) Observations : Each numerical figure in a data is called an observation.
(vi) Frequency of an observation : The number of times a particular observation occurs is called its frequency.
(vii) Statistics : It is the subject that deals with the collection presentation analysis and interpretation of numerical data.

Question 2.
Solution:
Arranging the given data in ascending order is as given below :
1, 1, 2, 2, 2, 2, 2, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6 and 6 its frequency table will be as under:

Question 3.
Solution:
Arranging the given data in ascending order,
260, 260, 300, 300, 300, 300, 360, 360, 360, 360, 360, 360, 400, 400, 400.
and its frequency table will be as under.

Question 4.
Solution:
Arranging the given data in ascending order we find
5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 9, 9, 10, 10 and its frequency table will be as under.

Question 5.
Solution:
(i) Data means information in the form of numerical figures.
(ii) Data obtained in the original form is called raw data.
(iii) Arranging the numerical figures in ascending or descending order is called an array.
(iv) The number of times a particular observation occurs is called its frequency.
(v) Arranging the data in the form of a table is called tabulation of data.

Question 6.
Solution:
First five natural numbers are 1, 2, 3, 4, 5

Question 7.
Solution:
First six odd natural numbers are 1, 3, 5, 7, 9, 11

Question 8.
Solution:
First seven even natural numbers are 2, 4, 6, 8, 10, 12, 14

Question 9.
Solution:
First five prime numbers are 2, 3, 5, 7, 11

Question 10.
Solution:
First six multiples of 5 are 5, 10, 15, 20, 25, 30

 

RS Aggarwal Solutions Class 7 Maths Chapter 21 Ex 21.1 – Overview

The first exercise of RS Aggarwal Solutions Class 7 Maths Chapter 21 contains 13 problems that require the use of basic concepts of Mean. 

The mean value is the average of the given data and can be calculated by dividing the total number of observations by the number of observations.

Assume that, in an information table, the value estimations of 10 apparel materials are provided. If we need to locate the mean of the costs, at that point add the costs of each garment material and divide the complete number by 10. It will bring about the average mean.

Formula To Calculate Mean

Mean = The sum of the provided Data /The Total number of Data

To calculate the arithmetic mean for the set of given data, here you should start by adding all the data values (X) & then dividing the output by the number of values (n).

The symbol ” ∑ “is generally used to indicate the fact that we need to sum up the values. Hence, we achieve the provided formula for calculating the mean (x̄) –

x̄ = ∑ x/n

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