Find the first and third quartiles, Q1 and Q3, of the following set of numbers.341, 240, 187, 373, 241, 455, 276, 210, 321

I searched Google under the key words "Quartiles" to get these possible sources:

(Broken Link Removed)
http://www.shodor.org/interactivate/discussions/BoxPlot/
http://en.wikipedia.org/wiki/Quartile
http://www.vias.org/tmdatanaleng/cc_quartile.html

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.