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 = 0.0;
double m;
for (int i = 0;i<a.length;i++) {
sum = sum + a[i];
}
m = ((double)(sum)) / a.length;
return m;
}
public double stddev() {
double mean;
double sum = 0.0;
for (int i=0;i<a.length;i++) {
sum = sum + a[i];
}
mean = (double)(sum) / a.length;
double newsum = 0.0;
double newmean, answer;
double[] result = new double[a.length];
for (int i =0;i<a.length;i++) {
result[i] = (a[i] - mean)*(a[i] - mean);
}
for (int i=0;i<a.length;i++) {
newsum = newsum + result[i];
}
newmean = newsum / result.length;
answer = Math.sqrt(newmean);
return answer;
}
}