Box plot

A box plot, also called a box and whisker plot, was created in 1977 by John Tukey. The plot is an efficient way of showing a five-number data summary. The box gives the middle 50% of the data. The upper edge gives the 75th percentile of the data set and the lower the 25th percentile. The line in the middle of the box represents the median value. The whiskers represent the minimum and maximum data values.