Well-designed AP Board Solutions Class 7 Maths Chapter 3 Data Handling Exercise 3.3 offers step-by-step explanations to help students understand problem-solving strategies.
Data Handling Class 7 Exercise 3.3 Solutions – 7th Class Maths 3.3 Exercise Solutions
Question 1.
Use the bar graph (Fig.) to answer the following questions.
a) Which is the most popular pet?
b) How many students have dog as a pet?
Solution:
a) The most popular pet is cat.
b) 8 students have dog as a pet.
Question 2.
Read the bar graph (Fig.) which show the number of books sold by a bookstore during five consecutive years and answer the following questions:
i) About how many books were sold in 1989 ? 1990 ? 1992?
Solution:
ii) In which year were about 475 books sold? About 225 books sold?
Solution:
In 1990, about 475 books were sold. In 1992, about 225 books were sold.
iii) In which years were fewer than 250 books sold?
Solution:
In 1989, 1992 years fewer than 250 books were sold.
iv) Can you explain how you would estimate the number of books sold in 1989 ?
Solution:
As the bar length is close to 200 we can estimate the value as 180.
Question 3.
Number of children in six different classes are 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 class eight.
Solution:
a) Depending upon the maximum and minimum values we can estimate the scale.
Here with 1 unit = 10 children scale is considered.
b) i) In fifth class, maximum number of children are there
In tenth class, minimum number of children are there.
ii) Students of class sixth : Students of class eight
120 : 100
12 : 10
6 : 5
Question 4.
The performance of a student in 1st Term and 2nd Term is given. Draw a double bar graph choosing appropriate scale and answer the following :
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?
Solution:
i) In Maths from 88 marks to 95 marks i.e., 7 marks improved mostly than the other subjects.
ii) In Social Science from 73 marks 75 marks i.e., 2 marks improved which is least than the other subjects.
iii) In Hindi from 72 marks to 65 marks i.e. 7 marks has come down.
Question 5.
Consider this data collected from a survey of a colony.
i) Draw a double bar graph choosing an àppropriate scale. What do you infer from the bar graph?
ii) Which sport is most popular?
iii) Which is more preferred, watching or participating in sports ?
Solution:
There are more people who will watch cricket them any other game.
There are less people who will watch Athletics than any other game.
ii) The most popular game is cricket.
iii) By observing the data, we can conclude that most of them are prefering to watch the game than participation.
Question 6.
Take the data giving the minimum and the maximum temperature of various cities given here plot a double bar graph using the data and answer the following :
Temperatures of Cities as on 20.6.2006
i) Which city has the largest difference in the minimum and maximum temperature on the given date?
ii) Which is the hottest city and which is 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) In Jammu, difference between maximum and minimum temperatures on given data is 41°C – 26°C = 15°C
ii) Hottest city is Jammu (41°C)
Coldest city is Bangalore (21°C)
iii) Bangalore and Jaipur (Or) Bangalore and Ahmedabad.
iv) In Mumbai, difference is 5°C.