Histogram

A Histogram is used to represent the data of a variable over a continuous interval. It is a precise display of the distribution of a set of continuous numerical data. Histogram was first introduces by Karl Pearson. It looks similar to bar graph but is different in sense that bar graph display values for 2 different variables and histogram relates to only one variable. A histogram unlike bar graph shows no gaps between the bars.

Steps to Draw Histogram

• Divide the entire range of values into series of intervals called bins.
• The bins must be of equal size and adjacent.
• Choose the correct bin width.

Example: To create a histogram displaying the top ten women’s figure skating scores for the 2010 Winter Olympics.

We should plot the frequency of each interval: 2 between 170-180, 4 between 180-190, 1 between 190-200, 2 between 200-210, and 1 between 220-230.