Jabarkan i    x[i] dari Kuartil dalam bahasa sunda

In both of the above cases, the first and third quartiles can be taken to be the median values of the lower and upper halves of the data, respectively.  However, there is more than one school of thought on how to apply this definition when the overall median is one of the original data values.  The next two examples are illustrations of some of the rules of thumb which have been adopted; neither always produces correct results, and it would be better to use a precise formulation as shown later.

One may include the median in both "halves" of the data: