Mean SAT (out of 1600) is 1474? Really, people? 1410 is 96th percentile, and it's the bottom 4th quartile. I guess the only people who remembered their scores were those who were proud of them.

This would imply that LW is about as selective as a top university (like Harvey Mudd). That doesn't seem that implausible to me- but I definitely agree that we should expect the true mean to be lower than the self-reported mean (both because of inflated memories and selective memories).