PAX is right!
Firing a qualifying score on a course of fire is an objective standard. If the shooter does that, does it matter if the class was all male, all female, 50/50,80/20, or any other mix?
You have clearly placed your social values ahead of the desired outcome:
Each student is capable of meeting the objective standard.
At our (non-stress) academy, our desired outcome was EVERYONE GRADUATES. I spent many a night and weekend with those having trouble, and in 9 years only had 2 failures. Over 5,000 succeeded, or a 0.0004 failure rate on the range.
Such a bias has no place in such a life or death training program. Either the student can, or cannot, meet the objective standard. How they get from "here" to "there" is irrelevant.