As you would expect in a graphics class, the curve is a piecewise polynomial!
The curve is a continuous function – we map to numbers in the range 0-4, but we don’t round. We’ll do rounding when we compute the final grades. We consider boundary cases carefully when we determine grades at the end of the semester.
The Median for the exam was 26. If you scored the median or above you got better than a B.
If your score is below 25, your grade is: 3 * (score-10)/15 (no one scored less than 10)
If your score is above 25-34, your grade is 3 + (score-25)/10
If your score is 35 or above, your grade is 4.