The high grade was actually 31, but that was a bit of an outlier, so I set the high score at 30 for the purposes of everyone’s grade. The top picks were fossil fuels, urbanization, railroads and canned foods; the least popular choices were Haiti, Paternalism and Samuel Smiles.
Grade | Minimum | Distribution |
A+ | 30 | |
A | 28.5 | 20% |
A- | 27 | |
B+ | 24.5 | |
B | 22 | 45% |
B- | 19.5 | |
C+ | 17 | |
C | 14.5 | 35% |
C- | 12 | |
D+ | 9.5 | |
D | 7 | 0% |
D- | 4.5 | |
F | 0 |