Curve B is a falling rate curve, i.e., the rate of deposition declines with time. Curve C is the usual form of the relationship between deposit thickness (or thermal fouling resistance) and time; it is an exponential or asymptotic curve.
Average GPA: 3.2. The average GPA at Goucher College is 3.2. This makes Goucher College Moderately Competitive for GPAs. (Most schools use a weighted GPA out of 4.0, though some report an unweighted GPA. With a GPA of 3.2, Goucher College accepts below-average students.
You can see that most had SAT scores (CR+M+W) of 1400 or higher, ACT composite scores of 19 or higher, and a high school average of B or better. Realize that grades matter much more than standardized test scores -- Goucher College has test-optional admissions. Note that there are a few red dots (rejected students) and yellow dots (waitlisted students) overlapping with the green and blue in the middle of the graph.