text: Interquartile Range ( IQR ) | Java program to find IQR of a data set ; Function to give index of the median ; Function to calculate IQR ; Index of median of entire data ; Median of first half ; Median of second half ; IQR calculation ; Driver Code
code: import java . io . * ; import java . util . * ; class GFG { static int median ( int a [ ] , int l , int r ) { int n = r - l + 1 ; n = ( n + 1 ) / 2 - 1 ; return n + l ; } static int IQR ( int [ ] a , int n ) { Arrays . sort ( a ) ; int mid_index = median ( a , 0 , n ) ; int Q1 = a [ median ( a , 0 , mid_index ) ] ; int Q3 = a [ mid_index + median ( a , mid_index + 1 , n ) ] ; return ( Q3 - Q1 ) ; } public static void main ( String [ ] args ) { int [ ] a = { 1 , 19 , 7 , 6 , 5 , 9 , 12 , 27 , 18 , 2 , 15 } ; int n = a . length ; System . out . println ( IQR ( a , n ) ) ; } }