stats.js

function stats(arr) {
    arr = arr.slice().sort();
    var n = arr.length;
    var sum = arr.reduce((acc, val) => acc + val, 0);
    var prod = arr.reduce((acc, val) => acc * val, 1);
    var amean = sum / n;
    var gmean = Math.pow(prod, 1 / n);
    var median = n % 2 === 0 ? (arr[n / 2 - 1] + arr[n / 2]) / 2 : arr[(n - 1) / 2];
    var variance = 0;
    var stddev = 0;

    var v1 = 0,
        v2 = 0;

    for (var i = 0; i < n; i++) {
        var dMean = arr[i] - amean;
        v1 += Math.pow(dMean, 2);
        v2 += dMean;
    }

    v2 *= v2 / n;
    variance = Math.max((v1 - v2) / (n - 1), 0);
    stddev = Math.sqrt(variance);

    return {
        count: n,
        min: Math.min.apply(Math, arr),
        max: Math.max.apply(Math, arr),
        sum: +sum.toFixed(2),
        median: +median.toFixed(2),
        amean: +amean.toFixed(2),
        gmean: +gmean.toFixed(2),
        variance: +variance.toFixed(2),
        stddev: +stddev.toFixed(2),
    };
}

var arr = [152.015,136.875,132.576,133.11,135.405,130.438,132.23,130.159,134.068,129.201];

console.log(stats(arr));