It would be the same concept.
Applicant - 620, 680 & 710
Co-applicant - 650, 690, 700
The policy is to use the highest middle score between the applicant & co-applicant. Which one of the 6 scores did you use?
The policy is to use the middle score of each applicant. Which 2 scores of the 6 did you use?
The opinions expressed are mine and they are not to be taken as legal advice.