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October 25, 2014

Homework Help: Algebra

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.

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