public class Mean {
  public static void main(String[] args) {
    double array[] =
      {0.0d, 1.0d, 2.0d, 3.0d, 4.0d, 5.0d, 6.0d, 7.0d, 8.0d, 9.0d};
    double sum = 0.0;
    for (double elem: array)
      sum += elem;
    System.out.println(sum/array.length);
  }
}