In Excel 2010, the QUARTILE() function was replaced with the QUARTILE.EXC() and QUARTILE.INC() functions to increase the accuracy of the results. To ensure the backward compatibility of QUARTILE.EXC() and QUARTILE.INC(), the QUARTILE() function is still available.
Definition. This function returns the quartile of a data set. Quartiles are often used in sales and survey data to divide populations into groups. For example, you can use QUARTILE() to find the top 25 percent of incomes in a population.
The quart argument indicates which value to return. Table 12-3 lists the values for this argument.
array (required). The array or cell range of numeric values for which you want the quartile value