Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

Session 4, Part B:
The Median and the Three-Number Summary

In This Part: The Median | The Three-Noodle Summary | The Three-Number Summary
Even Data Sets | Review

This activity requires the Flash plug-in, which you can download for free from Macromedia's Web site. For a non-interactive version, review how you would find the Three-Noodle Summary using a set of nine noodles and a set of 10 noodles.

Use the following Interactive Activity to review the location of the median for odd and even data sets.

As we have seen with the noodle examples, the median divides ordered numeric data into two groups, each with the same number of data values.

If you only know the Three-Number Summary (Min, Med, and Max) for a set of data, you can still glean quite a bit of information about the data. You know that all the data values are between Min and Max, and you know that Med divides the data into two groups of equal size. One group contains data values to the left of Med, and the other group contains data values to the right of Med. You also know that the group of values to the left of the median must be lower than (or equal to) the median in value, and that the group of values to the right of the median must be greater than (or equal to) the median in value.

 Session 4: Index | Notes | Solutions | Video