Data Handling
Exercise 3.3
1). Use the bar graph (Fig 3.3) to answer the following questions.
(a) Which is the most popular pet?
(b) How many students have dog as a pet?
Answer:
(a) Which is the most popular pet?
cats
(b) How many students have dog as a pet?
8
2). Read the bar graph (Fig 3.4) which shows 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?
(ii) In which year were about 475 books sold? About 225 books sold?
(iii) In which years were fewer than 250 books sold?
(iv) Can you explain how you would estimate the number of books sold in 1989?
Answers:
(i) About how many books were sold in 1989? 1990? 1992?
Books sold in 1989 are 175
Books sold in 1990 are 475
Books sold in 1992 are 225
(ii) In which year were about 475 books sold? About 225 books sold?
475 books were sold in the year 1990 and 225 books were sold in 1992.
(iii) In which years were fewer than 250 books sold?
Fewer than 250 books were sold in the years 1989 and 1992.
(iv) Can you explain how you would estimate the number of books sold in 1989?
Scale taken here is 1 cm = 100 books.
10 mm = 100
1 mm = 10.
Each single line on y-axis represents 10 books.
Graph lies between 7th and 8th line between 100 and 200 books
therefore, it is 175.
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.
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?
5). Consider this data collected from a survey of a colony.
(i) Draw a double bar graph choosing an appropriate 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?
6). Take the data giving the minimum and the maximum temperature of various cities
given in the beginning of this Chapter (Table 3.1). Plot a double bar graph using the
data and answer the following:
(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.
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