Above Average Solution:

#include <bits/stdc++.h>
using namespace std;

int main(){
    // #ifndef ONLINE_JUDGE
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
    // #endif

    int cases;
    cin >> cases;
    for (int i = 0; i < cases; ++i)
    {
    	int n_scores;
    	cin >> n_scores;
    	int scores[n_scores];
    	int sum = 0;
    	for (int i = 0; i < n_scores; ++i)
    	{
    		cin >> scores[i];
    		sum += scores[i];
    	}
    	double average = (double) sum / n_scores;
    	int above_avg = 0;
    	for (int i = 0; i < n_scores; ++i)
    	{
    		if(scores[i] > average){
    			above_avg++;
    		}
    	}
    	cout << fixed << setprecision(3) << (double) above_avg / n_scores * 100 << "%" << endl;
    }

	return 0;
}