title: Finding average of a text file
body: <p>I am fairly new to java and I'm trying to code to find the average. I understand that the average is adding all the numbers and then dividing the sum by the number of numbers but I'm not really sure how to code that. My guess is that I'd need a for loop but I don't know what to do from there. The program basically asks for a file to be read and then calculate the average. Here's the code I have so far:</p>
  
  <pre><code>import java.util.Scanner;
  import java.io.File;
  import java.io.FileNotFoundException;
  public class Calculations 
  {
  
  public static void main(String[] args) throws FileNotFoundException 
  {
      System.out.println("Please enter a file name");
      Scanner keyboard = new Scanner(System.in);
  
      String filename = keyboard.next();
      Scanner reader = new Scanner (new File(filename));
  
      int length = reader.nextInt();
  
      double [] num = new double[length];
      double [] num2 = new double[length];
  
      System.out.println("The numbers are:");
  
      for(int i = 0; i &lt; length; i++)
      {
          num[i] = reader.nextDouble();
          System.out.println(num[i]);
      }
  
  }
  </code></pre>
  
  <p>}</p>
  
  <p>The file I would be using is list.txt which contains: </p>
  
  <pre><code>20
      1.1 2 3.3 4 5.5 6 7 8.5 9 10.0
  
      11 12.3 13 14 15.5 16.1 17 18 19.2 20.0
  </code></pre>
  
  <p>The mean should be 10.625. Any help is deeply appreciated. Thank you in advance. </p>