Number of Scores Posted: Differentials Used 1 to 4 scores: Temporary Index 5 scores: Lowest Score Differential 6 to 8 scores: Average of 2 Lowest Score Differentials 9 to 11 scores: Average of 3 Lowest Score Differentials 12 to 14 scores: Average of 4 Lowest Score Differentials 15 or 16 scores: Average of 5 Lowest Score Differentials 17 or 18 scores: Average of 6 Lowest Score Differentials 19 scores: Average of 7 Lowest Score Differentials 20 scores: Average of 8 Lowest Score Differentials Take Average of Lowest Score Differentials Used and then multiply by .96