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# 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.

 Yu-Na Kim 228.5 Mao Asada 205.5 Joanie Rochette 202.64 Mirai Nagasu 190.15 Miki Ando 189.1 Laura Lepisto 187.97 Rahail Flatt 182.49 Akiko Suzuki 181.41 Alena Leonova 172.43 Ksenia Makarova 171

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.

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