Midterm Histogram and Suggested (Non-Binding) Grade Equivalents. Test date: 10 Oct 06 25 XX 24 X 23 XX 22 XX 21 XX 20 XXXX 19 X 18 XX 17 16 X 15 X 14 13 12 X 11 Notes: 25-24 A 23-22 A-/B+ 21-18 B 16-12 C