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.

## Answer this Question

## Related Questions

- Precalculus - Question Details: Finding Regression for each set of data & ...
- statistics - calculate the correlation for data set A. Data Set A: xi = 65, 55, ...
- Math - I am supposed to find the 1st and 3rd quartiles of the following.And they...
- math - Find the first, second, and third quartiles of the data. 15, 6, 1, 13, 5...
- Math- HELP - How do I Find the first and third quartiles, Q1 and Q3, of the ...
- statistics - Twelve college students were surveyed about the distance from their...
- MTH233/statistics UOP - Find one quantitative and one qualitative data set from ...
- Algebra - Find the first and third quartiles of the data set. 1, 5, 1, 2.5, 3, 2...
- statistics - I am seeing some inconsistencies with regards to finding the upper ...
- math - 4. For Questions 4-7, use the following data: The number of file ...

More Related Questions