# NCERT Class 7 Mathematics Solutions: Chapter 3 –Data Handling Exercise 3.3 Part 2

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1. Number of children in six different classes are given below. Represent the data on a bar graph.

Class | Fifth | Sixth | Seventh | Eighth | Ninth | Tenth |

No. of children |

(a) How would you choose a scale?

(b) Answer the following questions:

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

(ii) Find the ratio of students of class sixth to the student of class eight.

Answer:

Data represented by the bar graph is as follows:

(a) Scale:

(b)

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

(ii) Ratio

2. The performance of a student in term and term is given. Draw a double bar graph choosing appropriate scale and answer the following:

Subject | English | Hindi | Maths | Science | S. Science |

term (MM 100) | |||||

(i) In which subject has the child improved his performance the most?

(ii) In which subject is the improvement the least?

(iii) Has the performance gone down in any subject?

Answer:

Data represented by bar graph is as follows:

Given data represented by bar graph

Difference of marks of 1st term and 2nd term

English

Hindi

Maths

Science

S. Science

(i) Child most improved performance in Maths subject.

(ii) In S. Science subject child improvement is less.

(iii) Yes, in Hindi subject, his performance has gone down.