Histogram of Equal Class Intervals
When histograms are drawn based on the data with equal class intervals, they are known as Histograms of equal class intervals. The histogram of equal class intervals includes rectangles with equal width; however, the length of the rectangles is proportional to the frequency distribution of the class intervals.
Example of Histogram of Equal Class Intervals:
Present the following information in the form of a Histogram:
| Marks | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 |
|---|---|---|---|---|---|
| Number of Students | 16 | 36 | 70 | 50 | 28 |
Solution
- It is visible that the set of data given is of the equal class interval; i.e., the difference between the upper limit and the lower limit of each class interval is 10. So, drawing a Histogram is feasible.
- The X-axis represents the marks (class intervals), and Y-axis represents the number of students (frequency distribution).