#include <stdio.h>

int main() {
	int n , i , j , m , sum , temp , count , a[1000] ;
	double b[1000] ;
	scanf( "%d" , &n ) ;
	for( i = 0 ; i < n ; ++ i ) 
	{
		scanf( "%d" , &m ) ;
		sum = 0 ;
		for( j = 0 ; j < m ; ++ j )
			scanf( "%d" , &a[j] ) ;
		for( j = 0 ; j < m ; ++ j )
			sum += a[j] ;
		temp = sum / m ;
		count = 0 ;
		for( j = 0 ; j < m ; ++ j )
			if( a[j] > temp ) count ++ ;
		b[i] = (double)count / m * 100 ;
	}
	for( i = 0 ; i < n ; ++ i ) 
		printf( "%.3lf%%\n" , b[i] ) ;
    return 0;
}