//  Data Structures with Java by John R. Hubbard
//  Copyright McGraw-Hill, 2001
//  Problem 2.10 on page 42

import schaums.dswj.Arrays;

public class Pr0210
{ private static final int SIZE = 4;
  private static double[] a = new double[SIZE];
  public static void main(String[] args)
  { schaums.dswj.Arrays.load(a,20,10);
    schaums.dswj.Arrays.print(a);
    System.out.println("mean(a) = " + mean(a));
  }
  private static double mean(double[] a)
  { double sum=0.0;
    for (int i=0; i<a.length; i++)
      sum += a[i];
    return sum/a.length;
  } 
}