But ... you really can't do the math, because you're pulling the discounts out of your butt. Even without accounting for interviewing skills (as
@Engrailed correctly points out), you're also failing to account for the fact that very few (or none) of the matriculants at these particular schools below the 25 %ile might be ORMs, so maybe the discount is .7, .8, or .9. Depending on what the rest of the application looks like, the OP's chances could literally be anywhere between 0% and 100%, and you have no way to know what the number is, even though you have now speculated 83%, a little lower than 83%, and 36%, based on how you are applying random variables to averages!
🙂
The fact is, we have no idea how "good" a chance at an A an ORM has with a way below average (for the school) MCAT. It might be great, and it might be terrible, but the odds of it tracking an "average" are close to zero, because over 75% of the people interviewing are going to have higher MCATs, and a significant number of the rest are going to be bringing something else to the table (diversity) besides great ECs. I'm sure the rest of the application is spectacular, but we have no way to know where that leaves the OP after the interview. I just think it's naive to think it leaves him in the same position as everyone else who interviews, given where he is starting out from ORM and MCAT. Don't want to be unduly pessimistic, but also don't want to sugarcoat issues the OP has spotted.