package 数学题;

import java.text.DecimalFormat;
import java.util.Scanner;

public class hdu_1115 {
    static class point {
        double x, y;

        point(double x, double y) {
            this.x = x;
            this.y = y;
        }
    }

    static point[] p;

    public static void main(String[] args) {
        DecimalFormat df= (DecimalFormat)DecimalFormat.getInstance();
        df.applyPattern("0.00");
        Scanner sc = new Scanner(System.in);
        int tcase = sc.nextInt();
        while (tcase-- > 0) {
            int n = sc.nextInt();
            p = new point[n];
            for (int i = 0; i < n; i++) {
                double x = sc.nextDouble();
                double y = sc.nextDouble();
                p[i] = new point(x, y);
            }
            double s = 0,sum=0;
            double gx  = 0,gy=0;
            for (int i = 1; i < n - 1; i++) {
                s = getArea(p[i], p[i + 1], p[0]);
                gx += s * (p[i].x + p[i + 1].x + p[0].x)/3;
                gy += s * (p[i].y + p[i + 1].y + p[0].y)/3;
                sum+=s;
            }
            double X = gx / sum;
            double Y =gy / sum;
            System.out.println(df.format(X)+" "+df.format(Y));
        }
    }
    ///叉积除二得面积
    private static double getArea(point p1, point p2, point p) {
        return ((p1.x - p.x) * (p2.y - p.y) - (p2.x - p.x) * (p1.y - p.y)) / 2;
    }
}