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.
The various parts involved to make a histogram are as follows:
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:
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 |
23-28 | 12 |
28-33 | 15 |
33-35 | 9 |
35-38 | 17 |
38-40 | 15 |
Solution:
Explanation: