That graph doesn't support your point. The Y-axis is the percentage of each ethnic group that achieved a certain score range. The statistic you are looking for

That graph doesn't support your point. The Y-axis is the percentage of each ethnic group that achieved a certain score range. The statistic you are looking for is the percentage of the total population that scored in each bucket grouped by ethnic group. Say you have a population that consists of 60 Asians and 940 non-Asians (which roughly matches the racial demographics of the United States) where 25% of Asians and 5% of non-Asians score above a 700 on the SAT math section. There would then be 15 Asians and 47 non-Asians who pass the bar. That means the Asian percentage of this theoretical group of qualified students would be ~24%. For comparison, Asians make up 27% of Princeton undergrads. Without the statistic I mentioned, you can't determine whether or not Asians are underrepresented.