import java.util.Arrays;
public class Arvutamine2{
    public static double keskmine(double[] arvud){
        return summa(arvud)/arvud.length;
    }
    public static double summa(double[] arvud){
        double vastus=0;
        for(double arv: arvud){
            vastus+=arv;
        }
        return vastus;
    }
    public static double[] arvudeks(String[] stringid){
        double[] arvud=new double[stringid.length];
        for(int i=0; i<stringid.length; i++){
            arvud[i]=Double.parseDouble(stringid[i]);
        }
        return arvud;
    }
    public static double standardhalve(double[] arvud){
        double k=Arvutamine2.keskmine(arvud);
        double abi=0;
        for(double arv:arvud){
            double vahe=arv-k;
            abi+=vahe*vahe;
        }
        return Math.sqrt(abi/arvud.length);
    }
    public static void main(String[] sm){
        System.out.println(Arrays.toString(arvudeks(sm)));
        System.out.println(summa(arvudeks(sm)));
        System.out.println(keskmine(arvudeks(sm)));
        System.out.println(standardhalve(arvudeks(sm)));
    }
}

/*
java Arvutamine2 4 4 4 4 5 5 7 3 
[4.0, 4.0, 4.0, 4.0, 5.0, 5.0, 7.0, 3.0]                                                                                           
36.0                                                                                                                               
4.5                                                                                                                                
1.118033988749895                                                                                                                  
sh-4.3$ ^C                                                                                                                         

*/