3 ms·
http://math.stackexchange.com/questions/95909/why-is-an-average-of-an-average-usually-incorrect http://math.stackexchange.com/questions/95909/why-is-an-aver...
by ecoffey 12y ago
http://math.stackexchange.com/questions/95909/why-is-an-average-of-an-average-usually-incorrect http://math.stackexchange.com/questions/95909/why-is-an-aver...