btwatts

function Stats(arr) {
  var self = this; 
	var theArray = arr || []; 
	
	//http://en.wikipedia.org/wiki/Mean#Arithmetic_mean_.28AM.29
	self.getArithmeticMean = function() {
	    var sum = 0, length = theArray.length; 
	    for(var i=0;i<length;i++) {
	        sum += theArray[i];
	    }