text: "use strict";
  
  var listSum = function(lst) {
  	return lst.reduce(function(a, b){ return a+b; });
  };
  
  module.exports = function(numbers) {
  	var sum = listSum(numbers);
  	var mean = sum/numbers.length;
  	var sqerrs = numbers.map(function(n){ return (n - mean)*(n - mean); });
  	var std = Math.sqrt(listSum(sqerrs)/numbers.length);
  	var interval = 1.959964*std/Math.sqrt(numbers.length);
  	return {
  		mean: mean,
  		std: std,
  		interval: interval
  	};
  };
  