Hi Karan,
There may be other ways to do this, but the following is one approach:
Add a column in your source data that calculates the percentile summary. For example:
=LOOKUP(PERCENTRANK.INC($B$2:$B$9,$B2), {0,25,50,75,100}/100)
where B2:B9 is numeric data, and the formula entered is to find the percentile rank for B2 rolled up to 0%, 25%, 50%, 75% or 100%
Remember to format the column as percentage.
In the Pivot table, you can now add a Report Filter on the Percentile column you added in the source data.
Hope this helps.
-Sajan.