import java.io.*;
import java.util.*;
public class ArrayStuff {
private int[] a;
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() {
double sum = 0;
for (int i=0; i<a.length; i++){
sum = sum + a[i];
i = i + 1;
}
double result = sum / a.length;
return result;
}
public double stddev() {
double sum = 0;
for (int i=0; i<a.length; i++){
sum = sum + a[i];
i = i + 1;
}
double mean = sum / a.length;
double result = 0;
for (int i=0; i<a.length;i++){
result = result + Math.pow(a[i]-mean,2);
i = i +1;
}
result = result/a.length;
return result;
}
}