Histogram


 
 
Concept Explanation
 

Histogram

Histogram: 

A histogram is a graphical representation of data like a bar graph with

1. Class intervals are represented on the horizontal axis .

2. No gap between the bars as there is no difference between the class intervals .

Method of constructing a histogram:

Step 1: Observe the class intervals of the distribution. If they are non overlapping (discontinuous), Change them into overlapping (continuous) classes.

Step 2: Locate the class boundaries on the x-axis (horizontal axis).

Step 3: Construct a vertical rectangle on each line segment representing a class interval such that the height of the rectangle represents frequency of the class interval.

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Sample Questions
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Question : 1

From the given histogram, answer the following questions:

Which class has the least number of students?

 

Right Option : B
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Question : 2

The histogram shows the height of girls of Model Public School. Answer the given question:

Find the total number of girls with height more than 140cm.

Right Option : B
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Explanation
Question : 3

From the given histogram, answer the following questions:

What is the class size of each interval?

 

Right Option : D
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Explanation
 
 


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