#include <iostream> using namespace std; double g,b; int a,s,t, n; int main() { cin >> t; for(int i = 0; i<t; i++) { s = 0; g = 0; cin >> n; for (int i = 0; i < n; i++) { cin >> a >> b; s += a; g += a * b; } printf("%d %.1f\n", s, g / s); } }