Study how to make a histogram

Histogram Definition : Histograms are nothing but the graphical display of tabular frequencies. In general, the histograms are shown as adjacent rectangles. Each rectangleis erected in terms of a particular interval provided the area should be equal to the frequency of the observations in the given interval. In this article study what is histograms, we are going to study about what the histograms means.

Various parts for how to make a histogram:

The various parts involved to make a histogram are as follows:

  • Title: The title defines the data that is present in the histogram.
  • Horizontal or X-Axis: The X-axis demonstrates you the scale of values into which the size fit. Single data peaks not observed.
  • Bars: Thebars contain two major characteristics height and width. The height denotes the total number of times the values within an interval happened. The width denotes the length of the interval enclosed by the bar. It is identical for all kinds of bars.
  • Vertical or Y- Axis: The Y-axis is the scale that demonstrates you the number of times the values within an interval happened.
  • Legend: Thelegend provides additional information about the documents where the information leads from and how the dimensions are composed.

Steps to study how to make histograms:

The following steps will help to study how to make histograms:

Step 1: First enter the class intervals on X-axis and the frequencies on Y-axis.

Step 2: Note that the scales for both the axes need not be the same.

Step 3: Class intervals should be limited. Suppose, If the intervals are in comprehensive form, just convert them to the limited form.

Step 4: Draw the rectangles with class intervals as bases and the equivalent frequencies as heights.

Step 5: The classes limits should be entered on X- axis and the frequency is on the Y- axis.

Step 6: Rectangle's height will be proportional to the class frequency and the intervals are same in them.

Step 7: Rectangle's areas will be proportional to the class frequency and the intervals are not similar.

Example to study how to make a histogram:


The example given below shows the different number of age group of employees working in a company. Make a histogram.

Age group(year)

Number of employees














  • Inthe histogram, we mention the different age group of employees in the company in the direction of x-axis with the interval ranged as 23-28, 28-33,33-35... The number of employees mentioned along y-axis are provided with the interval of 0,2,4,6,……
  • At first we can make the histogram graph for age group 23 to 28 with the equivalent members of 12.
  • If we continue the process for all the table values; it will give the histogram graph.