## Introduction to Box Plots

## Opening

# Introduction to Box Plots

This image shows a box-and-whisker plot (or just a box plot).

Discuss the following information with your partner.

- To draw a box plot you need to know five numbers, called the five-number summary:
The least value in the set of data*Lower extreme:*The middle of the lower half of the data*Lower quartile:*The middle value*Median:*The middle of the upper half of the data*Upper quartile:*The greatest value in the set of data*Upper extreme:*

- The box part of a box plot shows the spread of the middle 50 percent of the data. The length of the box is called the
*interquartile range*and represents the distance between the upper and lower quartiles.