Related Functions:
The QUARTILE.INC function returns the quartile of a data set, based on percentile values from 0…1, inclusive.
 This function was introduced in Excel 2010 and so is not available in earlier versions.
 The QUARTILE.INC function replaces the QUARTILE function included in earlier versions of Excel.
Syntax
=QUARTILE.INC(array,quart)
Arguments
Argument  Description  

array  The range of data values for which you want to calculate the specified quartile  
quart  An integer between 0 and 4, representing the required quartile

Examples
A  B  C  D  E  

1  Data  Formula  Result  Notes  
2  9  =QUARTILE.INC(A2:A10,3)  32  The third quartile (75th percentile) of the data  
3  37  
4  20  
5  6  
6  16  
7  26  
8  32  
9  32  
14 
Note: The Quartile.Inc function is closely related to the PERCENTILE.INC such that:
 The 1st quartile is the same as the 25th percentile
 The 2nd quartile is the same as the 50th percentile
 The 3rd quartile is the same as the 75th percentile
 The 4th quartile is the same as the 100th percentile – the maximum value in the range
Common Function Error(s)
Problem  What went wrong  

#VALUE!  Occurs if the supplied value of quart cannot be interpreted as a numeric value  
#NUM!  Occurs if either:

The 1st, 2nd, 3rd or 4th quartile of a range of data is the value that 25%, 50%, 75% or 100% (respectively) of the data values fall within.
The QUARTILE.INC and QUARTILE.EXC functions both find a requested quartile of a supplied data set. The difference between these two functions is that the QUARTILE.INC function bases its calculation on a percentile range of 0 to 1 inclusive, while the QUARTILE.EXE function bases its calculation on a percentile range of 0 to 1 exclusive.
See Wikipedia for more information on quartile.