Posted by **Anonymous** on Thursday, April 3, 2008 at 8:52pm.

I am having trouble with finding the 1st and 3rd quartiles of a set of data. For example, let's say the data is:

4, 9, 11, 16, and 24<- these are cumulative frequencies. The median (or 2nd percentile)is 11, right? My teacher says it's 12. Then for 3rd quartile I got 20, but my teacher says 18. Can someone explain to me what I am doing wrong?

Thanks.

- Algebra -
**PsyDAG**, Friday, April 4, 2008 at 12:28pm
The median is *always* the **50th** percentile or 2nd **quartile**.

You seem to give frequencies (Y-axis/ordinate values), but do not give the quality/quantity in which these frequencies occur (X-axis/abscissa).

These are frequencies of what? Height? Weight? Test scores?

The quartiles would be given in terms of the abscissa values.

I hope this helps. If not, repost with more complete data. Thanks for asking.

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