Unlikely. Per the Common Data Set, 13% of enrolled students had an ACT of 29 or below. But my guess that a good chunk of them are recruited athletes or similarly hooked.
https://www.brown.edu/about/administration/institutional-research/sites/brown.edu.about.administration.institutional-research/files/uploads/CDS_2017-2018.pdf
You’ve asked this question before and received similar responses:
http://talk.collegeconfidential.com/brown-university/2073300-i-want-to-go-to-brown-university-but-i-have-a-low-act-sat-scores.html#latest