import java.io.*;
import java.util.*;
public class Array3 {
private int[] a;
private Random r;
public Array3() {
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;
double average;
for (int i=0; i<a.length;i++){
sum = sum + a[i];
}
average = sum/a.length;
return average;
}
public double stddev(){
double mean = mean();
double newSum = 0;
for (int i = 0; i<a.length; i++){
newSum = newSum + Math.pow((a[i] - mean),2);
}
double newMean = newSum/a.length;
return Math.sqrt(newMean);
}
}