title: How to compute the sum and average of elements in an array?
body: <p>I am having problems adding all the elements of an array as well as averaging them out. How would I do this and implement it with the code I currently have? The elements are supposed to be defined as I have it below.</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
  //&lt;![CDATA[
  
  var i;
  var elmt = new Array();
  
  elmt[0] = "0";
  elmt[1] = "1";
  elmt[2] = "2";
  elmt[3] = "3";
  elmt[4] = "4";
  elmt[5] = "7";
  elmt[6] = "8";
  elmt[7] = "9";
  elmt[8] = "10";
  elmt[9] = "11";
  
  // Problem here
  for (i = 9; i &lt; 10; i++){
    document.write("The sum of all the elements is: " + /* Problem here */ + " The average of all the elements is: " + /* Problem here */ + "&lt;br/&gt;");
  }   
  
  //]]&gt;
  &lt;/script&gt;
  </code></pre>