Observe the following data:
(a) Draw a double bar graph choosing an appropriate scale. What do you infer from the bar graph?
(b) Which class has the maximum number of students?
(c) In which class, the difference of total students and number of students present is minimum?
(d) Find the ratio of number of students present to the total number of students of Class IX.
(e) What per cent of Class VI students were absent?
Solution:
Given, the table represents the daily attendance of different classes in Government school of Chandpur.
(a) We have to draw a double bar graph choosing an appropriate scale.
The double bar graph depicts the information about total number of students and number of students present from Class VI to Class X.
(b) We have to find the class which has the maximum number of students.
From the graph,
Class VIII has the maximum number of students.
(c) We have to find the class in which the difference of total students and number of students present is minimum.
Difference of total students and number of students present in Class VI = 90 – 81 = 9
Difference of total students and number of students present in Class VII = 82 – 76 = 6
Difference of total students and number of students present in Class VIII = 95 – 91 = 4
Difference of total students and number of students present in Class IX = 70 – 65 = 5
Difference of total students and number of students present in Class X = 63 – 62 = 1
Therefore, class X has the minimum difference of total students and number of students present
(d) We have to find the ratio of number of students present to the total number of students of Class IX.
Number of students present in class IX = 65
Total number of students in class IX = 70
Ratio = 65/70
= 13 : 14
(e) We have to find the percent of Class VI students who were absent.
Total number of students in class VI = 90
Number of students present in class VI = 81
Number of students absent in class VI = 90 - 81 = 9
Percentage of students absent = 9/90 × 100
= 100/10
= 10%
✦ Try This: The data given below shows the production of motor bikes in a factory for some months of two consecutive years.
| Months | January | February | March | April | May |
| 2009 | 3000 | 4000 | 3400 | 3300 | 5600 |
| 2008 | 4500 | 3500 | 4600 | 3200 | 5400 |
Study the table given above and answer the following questions: In which month for the year 2008, the production was the least?
☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 3
NCERT Exemplar Class 7 Maths Chapter 3 Problem 83
Observe the following data: (a) Draw a double bar graph choosing an appropriate scale. What do you infer from the bar graph? (b) Which class has the maximum number of students? (c) In which class, the difference of total students and number of students present is minimum? (d) Find the ratio of number of students present to the total number of students of Class IX. (e) What per cent of Class VI students were absent
Summary:
(a) The double bar graph for the given data is mentioned above. The double bar graph depicts the information about total number of students and number of students present from Class VI to Class X, (b) Class VIII has the maximum number of students, (c) In class X, the difference of total students and number of students present is minimum, (d) The ratio of number of students present to the total number of students of Class IX is 13 : 14, (e) The percent of Class VI students who were absent is 10%
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