[Solved] find the average of both arrays, and then spit out the greater of the two

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If you want to get the average of the elements in a and b, you need to be summing those elements, not the elements of first.

Also, you had an extra ; after if (avg1 > avg2), which was creating an empty body for that conditional, so return "first" was being executed unconditionally.

function compare(a,b) {
    var sum = 0;
    for(var i=0; i<a.length;i++) {
        sum += a[i];
        var avg1 = (sum/a.length);
    }

    var sum2 = 0;
    for(i=0;i<b.length;i++) {
        sum2 += b[i];
        var avg2 = (sum2/b.length);
    }
    if (avg1 > avg2) {
        return "first";
    } else {
        return "second";
    }
}
alert(compare([80, 100], [100, 100]));
alert(compare([100, 150, 200], [50, 75, 100, 110]));

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solved find the average of both arrays, and then spit out the greater of the two