According to the figures in College Navigator and IPEDS, black students make up 7% of the undergraduate full-time enrollment across the full Ivy League. According to http://web1.ncaa.org/rgdSearch/exec/saSearch , black students make up 8% of the sports roster across the full Ivy League. Both numbers are underestimated due to the way they classify race, but it’s a consistent classification between the two databases. It’s not a matter of being under-represented overall. It’s more being over-represented in the popular sports that I mentioned earlier… particularly the two sports that colleges tend to give the most admission boosts for top athletes… and under-represented in sports like sailing, skiing, equestrian, etc. Ivy League colleges offer far more of these under-represented sports than more typical colleges.