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Question
Number of children in six different classes are given below. Represent the data on a bar graph.
| Class | Fifth | Sixth | Seventh | Eighth | Ninth | Tenth |
| Number of children | 135 | 120 | 95 | 100 | 90 | 80 |
- How would you choose a scale?
- Answer the following questions:
- Which class has the maximum number of children? And the minimum?
- Find the ratio of students of class sixth to the students of class eight.
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Solution
a. We will choose a scale as 1 unit = 10 children because we can represent a more clear difference between the number of students of class 7th and that of class 9th by this scale.
b. i. Since the bar representing the number of children for class fifth is the tallest, there are maximum number of children in class fifth. Similarly, since the bar representing the number of children for class tenth is the smallest, there are minimum number of children in class tenth.
ii. The number of students in class sixth is 120 and the number of students in class eight is 100. Therefore, the ratio between the number of students of class sixth and the number of students of class eight
= `120/100`
= `6/5`
= 6 : 5
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| 2005-2006 2007-2008 2008-2009 2009-2010 |
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| 2009-2010 | 63 | 18 |
Practice time: Afterschool
Ask 10 of your friends about what they like to do most after school.
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| Watching TV | |
| Playing football | |
| Reading storybooks | |
To represent the population of different towns using bar graph, it is convenient to take one unit length to represent one person.
The following bar graph represents the data for different sizes of shoes worn by the students in a school.
Read the graph and answer the following questions.
Scale: 1 unit length = 50 students
- Find the number of students whose shoe sizes have been collected.
- What is the number of students wearing shoe size 6?
- What are the different sizes of the shoes worn by the students?
- Which shoe size is worn by the maximum number of students?
- Which shoe size is worn by minimum number of students?
- State whether true or false:
The total number of students wearing shoe sizes 5 and 8 is the same as the number of students wearing shoe size 6.
Number of mobile phone users in various age groups in a city is listed below:
| Age group (in years) | Number of mobile users |
| 1 – 20 | 25000 |
| 21 – 40 | 40000 |
| 41 – 50 | 35000 |
| 61 – 80 | 10000 |
Draw a bar graph to represent the above information.
| Crop | Area of land (in million hectares) |
| Rice | 50 |
| Wheat | 30 |
| Pulses | 20 |
| Sugarcane | 25 |
| Cotton | 15 |
Prepare a bar graph of the data.
The representation of data with bars of uniform width is called ______.
Study the double bar graphs given below and answer the following questions:
- Which sport is liked the most by Class VIII students?
- How many students of Class VII like Hockey and Tennis in all?
- How many students are there in Class VII?
- For which sport is the number of students of Class VII less than that of Class VIII?
- For how many sports students of Class VIII are less than Class VII?
- Find the ratio of students who like Badminton in Class VII to students who like Tennis in Class VIII.
