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