HBSE 7th Class Maths Solutions Chapter 3 Data Handling Ex 3.3

Haryana State Board HBSE 7th Class Maths Solutions Chapter 3 Data Handling Ex 3.3 Textbook Exercise Questions and Answers.

Haryana Board 7th Class Maths Solutions Chapter 3 Data Handling Exercise 3.3

Question 1.
Use the bar-chart to answer the following questions :
(a) Which is the most popular pet ?
(b) How many children have a dog as a pet ?
HBSE 7th Class Maths Solutions Chapter 3 Data Handling Ex 3.3 1
Solution:
(a) cats
(b) 8.

HBSE 7th Class Maths Solutions Chapter 3 Data Handling Ex 3.3

Question 2.
Read the bar-graph and answer the questions that follows :
Number of books sold by a bookstore during five consecutive years.
HBSE 7th Class Maths Solutions Chapter 3 Data Handling Ex 3.3 2
(i) About how many books were sold in 1989 ? 1990 ? 1992 ?
(ii) In which year were about 475 books sold ? About 225 books ?
(iiii) In which years were fewer than 250 books sold ?
(iv) Can you explain how you would estimate the number of books sold in 1989 ?
Solution:
(i ) Many books were sold in 1989,1990, 1992
In 1989 = 175. In 1990 = 475, In 1992 = 225 Total = 175 + 475 + 225 = 875 books
(ii) 1990, 1992
(iii) 1989 and 1992.
(iv)Scale : 1 cm = 100 books In 1989 scale is 1.75 cm
∴ Books = 1.75 x 100 = 175 books.

Question 3.
Number of children in six different classes are given below. Represent the data on a bar-graph.

Class Number of Children
Fifth 135
Sixth 120
Seventh 95
Eighth 100
Ninth 90
Tenth 80

(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 class eight.
Solution:
HBSE 7th Class Maths Solutions Chapter 3 Data Handling Ex 3.3 3
(a) Scale : 1 cm = 20 children in y-axis.
(b) (i) Fifth class has the maximum number of children = 135
Tenth class has the minimum number of children = 80.
(ii) Ratio of students of class sixth to eighth = 120 : 100 = \(\frac{120}{100}=\frac{12}{10}=\frac{6}{5}\) = 6:5

HBSE 7th Class Maths Solutions Chapter 3 Data Handling Ex 3.3

Question 4.
The performance of students in 1st Term and 2nd Term is given. Draw a double bar graph choosing appropriate scale and answer the following:

 

Subject 1st Term (MM: 100) 2nd Term (MM: 100)
English 67 70
Hindi 72 65
Maths 88 95
Science 81 85
S. Science 73 75

(i) In which subject, has the child improved his performance the most ?
(ii) In which subject is the improvement least ?
(iii) Has the performance gone down in any subject ?
Solution:
HBSE 7th Class Maths Solutions Chapter 3 Data Handling Ex 3.3 4
(i) Maths
(ii) Maths
(iii) Hindi

Question 5.
Consider this data collected from a survey of a colony.
HBSE 7th Class Maths Solutions Chapter 3 Data Handling Ex 3.3 5
(i) Draw a double bar graph choosing an appropriate scale.
What do you infer from the bar graph.
(ii) Which sports is most popular ?
(iii) What is more preferred, watching or participating in sports ?
Solution:
HBSE 7th Class Maths Solutions Chapter 3 Data Handling Ex 3.3 6
(i) Cricket is most popular than other sports, because 1240 watching and 620 participating.
(ii) Cricket
(iii) Watching.

HBSE 7th Class Maths Solutions Chapter 3 Data Handling Ex 3.3

Question 6.
Take the data giving the minimum and the maximum temperature of various cities given in the beginning of this chapter. Plot a double bar-graph using the data:
(i) Which city has the largest difference in the minimum and maximum temperature on the given date ?
(ii) Which is the hottest and the coldest city ?
(iii) Name two cities where maximum temperature of one was less than the minimum temperature of the other.
(iv) Name the city which has the least difference between its minimum and the maximum temperature.
Solution:
(i) Jammu,
(ii) Jammu and Bangalore,
(iii) Bangalore, Amritsar
(iv) Mumbai. (See Fig. )
HBSE 7th Class Maths Solutions Chapter 3 Data Handling Ex 3.3 7

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