1. 


/**
 * FWP, Ausgewählte Probleme aus dem ACM Programming Contest, WS10/11 
 * Problem: 10370 Above Average
 * Link: http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=15&page=show_problem&problem=1311
 * 
 * @author Fabian Liebl
 * @version 1.0, 10/06/2010
 * 
 * Method : Ad-Hoc
 * Status : Accepted
 * Runtime: 0.268
 */

import java.io.*;

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader inputReader = new BufferedReader(new InputStreamReader(System.in));
		
		int testCases;
		int peopleInClass;
		double average;
		double aboveAverage;
		
		String[] line;
		
		testCases = Integer.parseInt(inputReader.readLine());
		
		for (int i = 0; i < testCases; i++) {
			line = inputReader.readLine().split(" ");
			
			peopleInClass = Integer.parseInt(line[0]);
			
			average = 0.0;
			for (int j = 0; j < peopleInClass; j++) {
				average += Integer.parseInt(line[j+1]);
			}
			
			average /= peopleInClass;
			
			aboveAverage = 0.0;
			for (int j = 0; j < peopleInClass; j++) {
				if (Integer.parseInt(line[j+1]) > average) {
					aboveAverage ++;
				}
			}
			
			aboveAverage /= peopleInClass;
			
			System.out.printf("%.3f%%\n", aboveAverage*100);
		}
	}

}