Congrats on your admission. Don’t know the admission rate but I’d surmise it doesn’t matter - you’re in!!
This was posted on another chat. One parent stated that much of it goes to IB. I went through the links (scroll to to the bottom and you can pull up each year’s class) and saw very little - but if a parent is stating it’s there, perhaps it is. You can ask the school for more info.
I put the chat I pulled this from down below too.
Lehigh IBE or UMich LSA? - College Search & Selection - College Confidential Forums