What Is a Special Type of Bar Graph in Which Data Are Grouped Into Intervals of Equal Width?


Angela Bailey

A special type of bar graph in which data are grouped into intervals of equal width is known as a histogram. A histogram is a graphical representation of a frequency distribution. It displays the frequency or count of each interval on the vertical axis and the intervals themselves on the horizontal axis.

Why Use Histograms?

Histograms are particularly useful when dealing with large sets of data or continuous variables, where individual data points are grouped together based on their values. They provide a visual summary of the distribution and shape of the data.

With histograms, you can easily identify patterns, trends, and outliers within your data. They allow you to answer questions such as:

  • What is the central tendency (mean, median, mode) of the data?
  • What is the spread (range, variance) of the data?
  • Are there any outliers in the dataset?
  • How does one group compare to another? (e.g., male vs. female)

Creating a Histogram

To create a histogram in HTML using JavaScript or any other programming language, you need to follow these steps:

  1. Gather your data: Collect the dataset you want to represent.
  2. Determine your intervals: Decide how many intervals you want and their width.
  3. Create frequency counts: Count how many values fall into each interval.
  4. Create an HTML bar chart: Use HTML elements like <div> or <svg> to represent the data as bars.
  5. Plot the bars: Set the height of each bar according to its frequency count.


Let’s consider an example where we want to create a histogram to represent the ages of students in a class. We have collected the following data:

Age Group Frequency
10-14 5
15-19 8
20-24 12
25-29 6

We can now create a histogram using this data. The x-axis represents the age groups, and the y-axis represents the frequency count.

Age Distribution Histogram:

In the example above, each bar represents an age group, and the height of each bar is proportional to the frequency count.


Histograms are a powerful tool for visualizing and analyzing data that is grouped into intervals of equal width. They help us understand the distribution, central tendency, and spread of the data. By using HTML styling elements like bold, underline,

    unordered lists

, and

  • list items
  • , we can create visually engaging tutorials that effectively communicate complex concepts.

    So go ahead and start creating your own histograms to gain valuable insights from your data!

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