[8/20/2012] Challenge #89 [easy] (Simple statistical functio

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;


public class Main
{

    public static void main(String[] args)
    {
        double[] doublearray = new double[60];

        try {
            BufferedReader in = new BufferedReader(new FileReader("source.txt"));
            String zeile = null;
            int zähler = 0;
            while ((zeile = in.readLine()) != null)
                {
                    doublearray[zähler] = Double.parseDouble(zeile);
                    zähler++;
                }
            }

        catch (IOException e)
        {
            e.printStackTrace();
        }

        double summe = 0;
        double durchschnitt = 0;
        double varianz = 0;
        double standardabweichung = 0;
        for (int i =0; i<doublearray.length;i++)
        {
            summe = summe + doublearray[i];
        }
        durchschnitt = summe/doublearray.length;
        System.out.println("Durchschnitt: " + durchschnitt);
        for ( int j = 0; j<doublearray.length; j++)
        {
            varianz = varianz + ((doublearray[j]-durchschnitt)*(doublearray[j]-durchschnitt));
        }
        varianz = varianz/doublearray.length;
        System.out.println("Varianz: " + varianz);
        standardabweichung = Math.sqrt(varianz);
        System.out.println("Standardabweichung: " + standardabweichung);
    }

}