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module.exports = mean;

function mean(arr) {

if (!Array.isArray(arr)) {

arr = [].slice.call(arguments);

}

if (!arr.length) {

throw new Error('no values were passed to `mean`');

}

var sum = 0;

var len = arr.length;

for (var i = 0; i < len; i++) {

var n = arr[i];

if (!Number.isFinite(n)) {

throw new Error('all values passed to `mean` must be numeric');

}

sum += n;

}

return sum / len;

}

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