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(){
int sum=0;
for (int q=0; q< a.length; q++) {
sum = sum + a[q];
}
double fin = (double) sum;
return fin/a.length;
}
public double stddev() {
double i= this.mean();
double std=0.0;
for (int q=0; q<a.length; q++) {
std= std + ((a[q]-i)*(a[q]-i));
}
std = std/a.length;
std = Math.sqrt(std);
return std;
}
}