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import java.util.*;

public class Main {

	public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		int n = scn.nextInt();
		while (n-- != 0) {
			int n1 = scn.nextInt(), count = 0;
			double tot = 0.0, arr[] = new double[n1];
			for (int i = 0; i < n1; i++) {
				arr[i] = scn.nextDouble();
				tot += arr[i];
			}
			tot /= n1;
			for (int i = 0; i < n1; i++) {
				if (arr[i] > tot)
					count++;
			}
			tot = 100 / ((double) n1 / count);
			System.out.printf("%.3f%%\n", tot);
		}
	}
		/* 
    題目：Q10370: Above Average
    作者：1010
    時間：西元 2016 年 7 月 */
}