In statistics, various measures are used to describe data set without listing all the data. Measures of spread are given by range, variation and standard deviation. Description of shapes are given like skewed, symmetric, unimodal and bimodal. We have measures of locations like mean and median. A set of five measures of location give us a good sense of the distribution of data. There are minimum value of data, first quartile, median, second quartile and maximum value of data.
Box-and-whisker-plot or diagram (also known as box-plot or bloxplot) is a way of representing these five values. It is helpful in interpreting the distribution of data. The first (lower) and third (upper) quartiles are at the ends of the box. The vertical line inside the box indicates the median. The ends of the whiskers represent maximum and minimum values of data set.
Example:
Use box and whisker plot to represents the values given below:
Minimum: 6
Maximum: 10
First quartile: 7
Median: 8
Third quartile: 9
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