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January 27, 2015

January 27, 2015

Posted by **p** on Wednesday, October 14, 2009 at 12:47pm.

- math115 -
**MathMate**, Wednesday, October 14, 2009 at 4:28pmIf you used the following formula to calculate the quartiles, the answers are correct.

There are different ways to calculate quartiles. One that is widely used is to calculate the location of the sorted list, given by:

i=(1/4)*(n+1) where n is the number of observations.

According to the formula, n=9, so the quartiles are at locations 2.5 and 7.5, the values of which are obtained by interpolation.

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