백준 4단계 no.7

import java.util.*;

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        double[] rate = new double[n];

        for (int i = 0; i < n; i++) {
            int m = sc.nextInt();
            int[] scoreArr = new int[m];
            int sum = 0;
            double count = 0;

            for (int j = 0; j < scoreArr.length; j++) {
                scoreArr[j] = sc.nextInt();
                sum += scoreArr[j];
            }

            for (int k = 0; k < scoreArr.length; k++) {
                if (scoreArr[k] > (sum / m)) {
                    count++;
                }
            }

            rate[i] = count / m;
        }

        for (int l = 0; l < n; l++) {
            String result = String.format("%.3f", rate[l]*100);
            System.out.println(result+"%");
        }
    }
}