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 answer = 0;
for (int i = 0;i < a.length;i ++) {
answer = answer + a[1];
}
return answer / a.length;
}
public double stddev() {
double mean = mean();
double answer = 0;
double answer2 = 0;
for (int i = 0;i < a.length;i ++) {
answer = (a[i] - mean) * (a[i] - mean);
answer2 = answer2 + answer;
}
return Math.sqrt (answer2 / a.length);
}
}