Actually, it is both factually and technically true. Human intelligence (usually IQ) is not something that can be measured in a vacuum, so it is generally meas

Actually, it is both factually and technically true. Human intelligence (usually IQ) is not something that can be measured in a vacuum, so it is generally measured in comparison to the whole. So scores are adjusted on a bell curve such that the mean and median score are the same. For IQ that is 100. So in the case of measuring intelligence, mean always equals median. But if we were talking about income, then of course you would be right. Way more than half of the world is below the average income.