2. Construction of a histogram

We know that histograms are created on continuous data.

 

Let us consider the data table given below and try to construct a histogram step-by-step.

 

Problem:

 

A private organization conducted a survey across hundred schools in Chennai. The organization collected the average number of kindergarten children in each classroom.

 

The data table looks like this:

 

 

Now, let us try to construct a histogram.

 

Step \(1\): Convert the data received into continuous data.

 

Here, the data is already in continuous form. Hence, no conversion is required.

 

Step \(2\): Select appropriate names and units for \(X\)-axis and \(Y\)-axis.

 

Here, the axes will look like this:

 

 

Step \(3\): Now mark the class intervals along the \(X\)-axis, and the frequency along the \(Y\)-axis.

 

 

Step \(4\): Now, construct rectangles with class intervals as the base, and the frequency as the height.