import java.io.*;
import java.util.*;
public class Arraystuff {
private int[] a;
private double[] b;
private double j = 0.0;
private Random r;
public Arraystuff() {
r = new Random();
a = new int[20];
for (int i=0;i<a.length;i++)
a[i]=r.nextInt(100);
}
public String toString() {
return Arrays.toString(a);
}
public int get(int n) {
return a[n];
}
public int findMaxIndex() {
int maxi = 0;
for (int i =0 ; i < a.length;i++) {
if (a[i]>a[maxi])
maxi = i;
}
return maxi;
}
public int find(int n) {
for (int i=0;i<a.length;i++) {
if (a[i]==n)
return i;
}
return -1;
}
public double mean(){
for (int i = 0;i < a.length; i++){
j = j + a[i];
}
j = j / a.length;
return j;
}
public double mean(double[] array){
for (int i = 0;i < array.length; i++){
j = j + array[i];
}
j = j / array.length;
return j;
}
public double stddev() {
b = new double[a.length];
double k = 0;
for (int i = 0; i < a.length; i++){
k = a[i];
k = (k - j);
k = k*k;
System.out.print(k +" ");
b[i] = k;
}
System.out.print("\n");
mean(b);
System.out.println(mean(b));
k = Math.sqrt(j);
return k;
}
}