JavaScript趣题：计算方差
var variance = function(numbers) {
var mean = 0;
var sum = 0;
for(var i=0;i sum += numbers[i];
}
mean = sum / numbers.length;
sum = 0;
for(var i=0;i sum += Math.pow(numbers[i] - mean , 2);
}
return sum / numbers.length;
};
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