import java.util.ArrayList;
import java.io.*;
import java.util.Scanner;
import java.lang.IndexOutOfBoundsException;
public class StatsDriver {
    public static void main (String [] args) {
        Statistics dhanya = new Statistics ();
        dhanya.read();
        dhanya.mode();
        dhanya.average();
        dhanya.standarddeviation();
    }
}
class Statistics
{
    double average = 0;
    ArrayList<Integer> numbers = new ArrayList<Integer>();
    Scanner in = null;
    int mode = 0;
    public Statistics () {
    }
    public void read () {
        try {

            in = new Scanner(new File("numbers.txt"));

        }

        catch (IOException i) {

            System.out.println("Error: " + i.getMessage());

        }

        while (in.hasNext()) {
            numbers.add(Integer.parseInt(in.next()));
        }
        System.out.println(numbers);
    }
    public double average () {
        double sum = 0;
        for (int i = 0; i < numbers.size(); i++) {
            sum += numbers.get(i);
        }
        average = sum/(numbers.size()+1);
        System.out.println(average);
        return average;
    }

    public double standarddeviation () {
        double locsum = 0;
        for (int i = 0; i < numbers.size(); i++) {
            locsum += Math.pow((numbers.get(i)-average), 2);
        }
        System.out.println(Math.sqrt(locsum/numbers.size()));
        return Math.sqrt(locsum/numbers.size());
    }

    public ArrayList mode () {
        ArrayList<Integer> mode = new ArrayList<Integer> ();
        mode.add(0);
        for (int i = 0; i <= 100;  i++) {
            int num = 0;
            for (int j = 0; j < numbers.size(); j++) {
                if (numbers.get(j) == i) {
                    num++;
                }
            }
            try {
                if (num == mode.get(1)) {
                    mode.add(i);
                }
                if (num > mode.get(1)) {
                    for (int k = 1; k < mode.size(); k++) {
                        mode.remove(mode.get(k));
                    }
                    mode.add(i);
                }
            }
            catch (IndexOutOfBoundsException e) {
                mode.add(i);
            }
        }
        mode.remove(mode.get(0));
        System.out.println(mode);
        return mode;
    }
}