This article cites a survey that claims alumni, not admits, all live in the same zip code. The study is also not about MIT.
It shouldn’t surprise anyone that good schools have better admission rates to good universities.
>It shouldn’t surprise anyone that good schools have better admission rates to good universities.
The actual answer is probably "it's complicated." MIT also doesn't want to filled with Stuyvesant and Bronx School of Science grads. (Though last time I saw the numbers they did admit a fair number anyway.) 5% of my small high school graduating class ended up at MIT but that was a long time ago and I assume that wouldn't happen today.
Or you get into MIT because of your zip code, which is basically true of all elite schools:
https://www.admissionsmadness.com/blog/your-zip-code-is-the-...
your half dozen friends are anecdotes.