NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Ex 3.3 are part of NCERT Solutions for Class 7 Maths. Here we have given NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Ex 3.3.

- Data Handling Class 7 Ex 3.1
- Data Handling Class 7 Ex 3.2
- 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 3.3 |

Number of Questions Solved |
6 |

Category |
NCERT Solutions |

## NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Ex 3.3

**Question 1.**

Use the bar graph to answer the following questions.

**(a)** Which is the most popular pet?

**(b)** How many children have dog as a pet?

**Solution:**

**(a)** The most popular pet is ‘Cat’.

**(b)** 8 children have a dog as a pet.

**Question 2.**

Read the bar graph which shows the number of books sold by a bookstore during five consecutive years and answer the following questions:

- About how many books were sold in 1989?1990?1992?
- ln which year were about 475 books sold? About 225 books sold?
- In which years were fewer than 250 books sold?
- Can you explain how you would estimate the number of books sold in 1989?

**Solution:
**Clearly, from the given graph, we have

- Number of books sold in the year

**1989:**170 (approx.)

**1990:**475 (approx.)

**1992:**225 (approx.) - In the year 1990, about 475 books were sold. In the year 1992, about 225 books were sold.
- Fewer than 250 books were sold in the years 1989 and 1992.
- It can be estimated using the height of the bar such that the height of 1 cm = 100 books.

**Question 3.**

The number of children in six different classes is given below. Represent the data on a bar graph.

**(a)** How would you choose a scale?

**(b)** Answer the following questions:

**(i)** Which class has the maximum number of children? And the minimum?

**(ii)** Find the ratio of students of class sixth to the students of the class eighth.

**Solution:
**

**(a)**Start the scale at 0. The greatest value in the data is 135, so end the scale at a value greater than 135, such as 140. Use equal divisions along the axes, such as increments of 10.

We know that all the bars would lie between 0 and 140.

We choose the scale such that the length between 0 and 140 is neither too long nor too small.

Here, we take 1 unit for 10 children.

**(b)**(i) Fifth class has the maximum number of children. Tenth class has the minimum number of children.

(ii) Ratio of students of class sixth to eighth = 120 : 100 = \(\frac { 12 }{ 100 } \) = \(\frac { 6 }{ 5 } \) = 6 : 5

**Question 4.**

The performance of a student in 1st Term and, 2nd Term is given. Draw a double bar graph choosing the appropriate scale and answer the following :

- In which subject, has the child improved his performance the most?
- In which subject is the improvement the least?
- Has the performance gone down in any subject?

**Solution:
**

- The child improved his performance the most in the subject of Maths.
- The improvement is the least in the subject of S. Science.
- Yes! The performance has gone down in the subject of Hindi.

**Question 5.**

Consider this data collected from a survey of a colony.

- Draw a double graph choosing an appropriate scale.

What do you infer from the bar graph? - Which sport is most popular?
- Which is more preferred, watching or participating in sports?

**Solution:
**

- It is inferred that more people prefer cricket and fewer athletics.
- The most popular sport is cricket.
- Watching is more preferred than participating.

**Question 6.**

Take the data giving the minimum and the maximum temperature of various cities given at the beginning of this chapter. Plot a double bar graph using the data and answer the following:

- Which city has the largest difference in the minimum and maximum temperature on the given date?
- Which is the hottest city and which is the coldest city?
- Name two cities where the maximum temperature of one was less than the minimum temperature of the other.
- Name the city which has the least difference between its minimum and the maximum temperature.

**Solution:
**

- The city Jammu has the largest difference in the minimum and maximum temperature on the given date.
- Jammu is the hottest city and Bangalore is the coldest city.
- The name of the two cities where the maximum temperature of one was less than the minimum temperature of the other is Bangalore and Jaipur or Bangalore and Ahmedabad.
- Mumbai has the least difference between its minimum and maximum temperature.

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