Given Data:

State	Number of Management Colleges
Rajasthan	200
Punjab	400
Gujarat	150

Steps to Construct a Bar Diagram

Step 1: Draw the X-axis and Y-axis.

• X-axis (horizontal): Represents the names of states.
• Y-axis (vertical): Represents the number of management colleges.

Step 2: Mark the numbers on the Y-axis.

Use equal intervals:

0, 100, 200, 300 and 400.

Step 3: Draw three bars.

• Rajasthan: Draw a bar up to 200.
• Punjab: Draw a bar up to 400.
• Gujarat: Draw a bar up to 150.

Step 4: Keep equal spaces between the bars.

All three bars should have equal width and equal gaps.

Simple Bar Diagram (Text Representation)

Number of Management Colleges

400

Punjab

200

Rajasthan

150

Gujarat

Values are shown as labels; draw actual vertical bars on your graph sheet for the exam.

Important observation

• Punjab has the highest number of management colleges (400).
• Gujarat has the lowest number (150).
• Rajasthan has 200 management colleges.

Quick Revision Table

Topic	Remember This
Data	Collection of facts and numbers.
Primary Data	First-hand information.
Secondary Data	Already collected information.
Variable	A characteristic measured in numbers.
Attribute	A quality or category.
Classification	Arranging data into groups.
Tabulation	Arranging data in rows and columns.
Diagram	Showing data through pictures or graphs.
Bar Diagram	Uses rectangular bars to compare values.
X-axis	Horizontal axis.
Y-axis	Vertical axis.

Important Points to Remember for Exams

1. Primary data = First-hand data.
2. Secondary data = Already collected data.
3. Variable = Numerical measurement.
4. Attribute = Qualitative characteristic.
5. Classification = Grouping of data.
6. Tabulation = Rows and columns.
7. Diagrammatic presentation = Visual presentation of data.
8. In the given bar diagram, Punjab has the highest value (400).