Exercise 3.3
1. Use the bar graph (Fig 3.3) to answer the following questions.
Fig 3.3
Solution:
We study the given bar graph and extract the required information.
From the given bar graph in the figure, we have
(a) Which is the most popular pet?
(b) How many students have dog as a pet?
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:
Fig 3.4
a
Solution:
We use the given bar graph to answer the given questions accurately.
From the given bar graph, we have
(i) About how many books were sold in 1989? 1990? 1992?
In 1989, about
(ii) In which year were about 475 books sold? About 225 books sold?
In
b
(iii) In which years were fewer than 250 books sold?
In
(iv) Can you explain how you would estimate the number of books sold in 1989?
From the graph, we can conclude that
3. Number of children in six different classes are given below. Represent the data on a .
Solution:
a
| Class | Fifth | Sbar graphixth | Seventh | Eighth | Ninth | Tenth |
|---|---|---|---|---|---|---|
| Number of Children | 135 | 120 | 95 | 100 | 90 | 80 |
bar graph
(a) How would you choose a scale?
Scale on y-axis is 1 unit =
(b) Answer the following questions:
(i) Which class has the maximum number of children? And the minimum?
Fifth class has the maximum number of children i.e.
The tenth class has the minimum number of children i.e.
Number of students in class sixth =
b
(ii) Find the ratio of students of class sixth to the students of class eight.
Number of students in class eighth =
Number of students in class sixth =
Ratio of Number of students in class eighth to number of students in class sixth = 120 : 100 = 6:5 = 6 : 5
5. Consider this data collected from a survey of a colony.
| Favourite Sport | Cricket | Basket Ball | Swimming | Hockey | Athletics |
|---|---|---|---|---|---|
| Watching | 1240 | 470 | 510 | 430 | 250 |
| Participating | 620 | 320 | 320 | 250 | 105 |
a
Solution:
We use the given table to draw the double bar graph as per the question.
(i) Draw a double bar graph choosing an appropriate scale.What do you infer from the bar graph?
This bar graph shows the number of people who are watching and participating in their favorite sports.
bar graph
b
(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:
a
Solution:
Given Table 3.1
| City | Max | Min |
|---|---|---|
| Ahmedabad | 38°C | 29°C |
| Amritsar | 37°C | 26°C |
| Banglore | 28°C | 21°C |
| Chennai | 36°C | 27°C |
| Delhi | 38°C | 28°C |
| Jaipur | 39°C | 29°C |
| Jammu | 41°C | 26°C |
| Mumbai | 32°C | 27°C |
Difference between the maximum and minimum temperature on 20.06.2006
Ahmedabad = (38°c - 29°c) =
Amritsar = (37°c - 26°c) =
Bangalore = (28°c - 21°c) =
Chennai = (36°c - 27°c) =
Delhi = (38°c - 28°c) =
Jaipur = (39°c - 29°c) =
Jammu = (41°c - 26°c) =
Mumbai = (32°c - 27°c) =
(i) Which city has the largest difference in the minimum and maximum temperature on the given date?
As it is clear from the above calculation, Jammu has the largest difference in the minimum and maximum temperature on the given data that is
(ii) Which is the hottest city and which is the coldest city?
Jammu is the hottest city with 41°c and Bangalore is the coldest city with
b
(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.
Mumbai has the least difference between its minimum and maximum temperature.
Maximum temperature =
Minimum temperature =