package backjoon;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.StringTokenizer;

// https://www.acmicpc.net/problem/4344

// 평균은 넘겠지

public class _4344 {

public static void main(String[] args) throws IOException {

//sol memory 13288 time 116

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

//테스트 케이스 개수

int cntCase = Integer.parseInt(br.readLine());

StringTokenizer st;

for(int i=0; i<cntCase; i++){

st = new StringTokenizer(br.readLine(), " ");

int cntStudent = Integer.parseInt(st.nextToken());

int[] score = new int[cntStudent];

int avg = 0;

double ratio = 0.0;

//배열에 성적 넣기

for(int j=0; j<cntStudent; j++){

if(!st.hasMoreTokens()) break;

score[j] = Integer.parseInt(st.nextToken());

avg += score[j];

}

//평균값(소수점 넷째자리에서 반올림)

avg = avg/cntStudent;

//평균을 넘는 학생의 비율

for(int k=0; k<cntStudent; k++){

if(score[k] > avg){

ratio++;

}

}

ratio = (ratio/cntStudent)*100.00;

System.out.printf("%.3f", ratio);

System.out.println("%");

}

}

}

/*

input

1

9 100 99 98 97 96 95 94 93 91

5

5 50 50 70 80 100

7 100 95 90 80 70 60 50

3 70 90 80

3 70 90 81

9 100 99 98 97 96 95 94 93 91

output

40.000%

57.143%

33.333%

66.667%

55.556%

*/