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CBSESecondary School (English Medium) (5 to 8) Class 7
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Syllabus

The representation of data with bars of uniform width is called ______.

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Question

The representation of data with bars of uniform width is called ______.

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Solution

The representation of data with bars of uniform width is called bar graph.

Explanation:

The representation of the data in the form of rectangles (bars) of uniform width is called a bar graph.

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Concept of Graph
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Q 27.
Chapter 3: Data Handling - Exercise [Page 74]

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NCERT Exemplar Mathematics Exemplar Class 7
Chapter 3 Data Handling
Exercise | Q 27. | Page 74

RELATED QUESTIONS

Read the bar graph (see the given figure) which shows the number of books sold by a bookstore during five consecutive years and answer the questions that follow:

  1. About how many books were sold in 1989? 1990? 1992?
  2. In which year were about 475 books sold? About 225 books sold?
  3. In which years were fewer than 250 books sold?
  4. Can you explain how you would estimate the number of books sold in 1989?

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
  1. Draw a double bar graph choosing an appropriate scale. What do you infer from the bar graph?
  2. Which sport is most popular?
  3. Which is more preferred, watching or participating in sports?

Try yourself

On any one day, choose any three cities and record their temperature from the TV or newspaper.

  • Make a bar chart in your notebook and ask your friends a few questions about it. See if they understand your chart!

In a bar graph, each bar (rectangle) represents only one value of the numerical data.


The following table gives the number of vehicles passing through a toll gate, every hour from 8.00 am. to 1.00 pm:

Time
Interval		 8.00
to
9.00		 9.00
to
10.00		 10.00
to
11.00		 11.00
to
12.00		 12.00
to
1.00
Number
of vehicles		 250 450 300 250 150

Draw a bar graph representing the above data.


Crop Area of land
(in million hectares)
Rice 50
Wheat 30
Pulses 20
Sugarcane 25
Cotton 15

Prepare a bar graph of the data.


In a public library, the following observations were recorded by the librarian in a particular week:

Days Mon Tues Wed Thurs Fri Sat
Newspaper
Readers		 400 600 350 550 500 350
Magazines
Readers		 150 100 200 300 250 200
  1. Draw a double bar graph choosing an appropriate scale.
  2. On which day, the number of readers in the library was maximum?
  3. What is the mean number of magazine readers?

Observe the following data:

Government School, Chandpur
Daily Attendance   Date: 15.4.2009
Class Total Students Number of Students
Present on that Day
VI 90 81
VII 82 76
VIII 95 91
IX 70 65
X 63 62
  1. Draw a double bar graph choosing an appropriate scale. What do you infer from the bar graph?
  2. Which class has the maximum number of students?
  3. In which class, the difference of total students and number of students present is minimum?
  4. Find the ratio of number of students present to the total number of students of Class IX.
  5. What per cent of Class VI students were absent?

Observe the given data:

Days of
the week		 Mon Tues Wed Thurs Fri Sat
Number of
Mobile Phone
Sets Sold		 50 45 30 55 27 60
  1. Draw a bar graph to represent the above given information.
  2. On which day of the week was the sales maximum?
  3. Find the total sales during the week.
  4. Find the ratio of the minimum sale to the maximum sale.
  5. Calculate the average sale during the week.
  6. On how many days of the week was the sale above the average sales?

The students of Class VII have to choose one club from Music, Dance, Yoga, Dramatics, Fine arts and Electronics clubs. The data given below shows the choices made by girls and boys of the class. Study the table and answer the questions that follow:

Clubs Music Dance Yoga Dramatics Fine Arts Electronics
Girls 15 24 10 19 27 21
Boys 12 16 8 17 11 30
  1. Draw a double bar graph using appropriate scale to depict the above data.
  2. How many students are there in Class VII?
  3. Which is the most preferred club by boys?
  4. Which is the least preferred club by girls?
  5. For which club the difference between boys and girls is the least?
  6. For which club is the difference between boys and girls the maximum?

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