NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Ex 3.1 are part of NCERT Solutions for Class 7 Maths. Here we have given NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Ex 3.1.

- Data Handling Class 7 Ex 3.2
- Data Handling Class 7 Ex 3.3
- Data Handling Class 7 Ex 3.4
- Data Handling Class 7 MCQ

Board |
CBSE |

Textbook |
NCERT |

Class |
Class 7 |

Subject |
Maths |

Chapter |
Chapter 3 |

Chapter Name |
Data Handling |

Exercise |
Ex 3.1 |

Number of Questions Solved |
9 |

Category |
NCERT Solutions |

## NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Ex 3.1

**Question 1.**

Find the range of heights of any ten students of your class.

**Solution:**

Please try yourself.

**Question 2.**

Organise the following marks in a class assessment, in a tabular form.

4, 6, 7, 5, 3, 5, 4, 5, 2, 6,

2, 5, 1, 9, 6, 5, 8, 4, 6, 7

**(i)** Which number is the highest?

**(ii)** Which number is the lowest?

**(iii)** What is the range of the data?

**(iv)** Find the arithmetic mean.

**Solution:
**

**(i)**Highest number is 9.

**(ii)**Lowest number is 1.

**(iii)**Range of the data = Highest observation – Lowest observation

= 9 – 1 = 8

**Question 3.**

Find the mean of first five whole numbers.

**Solution:**

First 5 whole numbers are 0, 1, 2, 3 and 4.

Their arithmetic mean

**Question 4.**

A cricketer scores the following runs in eight innings:

58, 76, 40, 35, 46, 45, 0, 100.

Find the mean score.

**Solution:
**

**Question 5.**

Following table shows the points of each player scored in four games:

Now answer the following questions:

- Find the mean to determine A’s average number of points scored per game.
- To find the mean number of points per game for C, would you divide the total points by 3 or by 4? Why?
- B played in all the four games. How would you find the mean?
- Who is the best performer?

**Solution:
**

So, A’s average number of points scored per game is 12.5.

(ii) To find the mean number of points per game for C, we shall divide the total points by 3 because the number of games under consideration is 4 but ‘C’ did not play game 3.

**Question 6.**

The marks (out of 100) obtained by a group of students in a science test are 85, 76, 90, 85, 39, 48, 56, 95, 81 and 75. Find the:

- Highest and the lowest marks obtained by the students.
- Range of the marks obtained.
- Mean marks obtained by the group.

**Solution:**

- Highest marks obtained by the students = 95

Lowest marks obtained by the students = 39 - Range of the marks obtained = Highest marks – Lowest marks = 95 – 39 = 56
- Mean marks obtained by the group

**Question 7.**

The enrolment of a school during six consecutive years was as follows:

1555, 1670, 1750, 2013, 2540, 2820.

Find the mean enrolment of the school for this period.

**Solution:**

Mean enrolment of the school for this period.

**Question 8.**

The rainfall (in mm) in a city on 7 days of a certain week was recorded as follows :

**(i) **Find the range of the rainfall in the above data.

**(ii)** Find the mean rainfall for the week.

**(iii)** On how many days was the rainfall less than the mean rainfall?

**Solution:**

**(i)** Range of the rainfall

= Highest rainfall – Lowest rainfall = 20.5 mm – 0.0 mm = 20.5 mm

**(ii)** Mean rainfall for the week

(iii) The rainfall was less than the mean rainfall on 5 days.

**Question 9.**

The heights of 10 girls were measured in cm and the results are as follows:

135, 150, 139, 128, 151,

132, 146, 149, 143, 141.

- What is the height of the tallest girl ?
- What is the height of the shortest girl?
- What is the range of the data?
- What is the mean height of the girls?
- How many girls have heights more than the mean height?

**Solution:**

**(i)** Height of the tallest girl = 151 cm

**(ii)** Height of the shortest girl = 128 cm

**(iii)** Range of the data

**(v)** 5 girls have heights more than the mean height.

We hope the NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Ex 3.1 help you. If you have any query regarding NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Ex 3.1, drop a comment below and we will get back to you at the earliest.

## Leave a Reply