who did the study? that methodology? which funded? what were the samples? how many subjects? an average of 1m84 is gigantic, we are talking here of medium
there is a difference between the average of all height and listed the most common height, especially as it is not a country known for its genetic stature, or to be in the sun, or for his diet, there is almost no factors that would justify such stature average
if you have links that I can read ...