lib/stats.js
function() {
			// Get the mean
			var mean = this.mean();

			// Get a new stats object to work with
			var nums = this.clone();

			// Map each element of nums to the square of the element minus the
			// mean
			nums.map(function(num) {
				return Math.pow(num - mean, 2);
			});

			// Return the standard deviation
			return Math.sqrt(nums.sum() / (nums.size() - 1));
		}
function() {
			// Get the mean
			var mean = this.mean();

			// Get a new stats object to work with
			var nums = this.clone();

			// Map each element of nums to the square of the element minus the
			// mean
			nums.map(function(num) {
				return Math.pow(num - mean, 2);
			});

			// Return the standard deviation
			return Math.sqrt(nums.sum() / (nums.size() - 1));
		}
function ( ) { // Get the mean
 var mean = this . mean ( ) ; // Get a new stats object to work with
 var nums = this . clone ( ) ; // Map each element of nums to the square of the element minus the
 // mean
 nums . map ( function ( num ) { return Math . pow ( num - mean , 2 ) ; } ) ; // Return the standard deviation
 return Math . sqrt ( nums . sum ( ) / ( nums . size ( ) - 1 ) ) ; }
Finds the standard deviation of the numbers.  Returns the standard deviation.
Finds the standard deviation of the numbers . Returns the standard deviation .