ArrayStuff.java

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;
    }
    //Sarah's code starts here
    public double mean(){
	int sum= 0;
	for (int i= 0; i<a.length; i++){
	    sum = sum + a[i];
	}
	return sum/(a.length);
    }
    public double stddv(){
	double[] b= new double[a.length];
	double mean1= mean();
	double mean2=0;
	for (int i=0; i<a.length; i++){
	    b[i]= a[i]-mean1;
	    b[i]= b[i]*b[i];
	    mean2=mean2+b[i];
	}
	mean2= mean2/ (double) b.length;
	return Math.sqrt(mean2);
    }

	
}