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; } }