#include <iostream>
#include <math.h>
using namespace std;

int main()
{
	cout << "Ile liczb chcesz wprowadzic?\n";
	int N;
	cin >> N;

	float sum = 0;
	cout << "Dobra. To pisz\n";
	float array[N];
	for(int i=0; i<N; i++){
		cin >> array[i];
		sum = sum + array[i];
	}
	float avg = sum / N;

	float sum2 = 0;
	cout << "Ilosc danych:\t\t\t" << N << endl;
	cout << "Wprowadzone dane:\n";
	for(int i=0; i<N; i++){
		cout << "\t\t\t\t" << array[i] << endl;
		sum2 = sum2 + (array[i] - avg)*(array[i] - avg);
	}

	cout << endl << "Srednia:\t\t\t" << avg << endl;
	cout << "Odchylenie standardowe:\t\t" << sqrt(sum2/N) << endl;
	return 420;
}