var variance = function(numbers) {

var mean = 0;

var sum = 0;

for(var i=0;i<numbers.length;i++){

sum += numbers[i];

}

mean = sum / numbers.length;

sum = 0;

for(var i=0;i<numbers.length;i++){

sum += Math.pow(numbers[i] - mean , 2);

}

return sum / numbers.length;

};

var mean = 0;

var sum = 0;

for(var i=0;i<numbers.length;i++){

sum += numbers[i];