“At the end of the semester, the total scores for all students will be arranged in numerical order, the score that corresponds to the 99th percentile (S99) will be determined, and then letter grades will be
assigned based on this percentile score as follows:
A: Total Score ≥ 0.90 x S99
B: 0.80 x S99 ≤ Total Score < 0.90 x S99
C: 0.70 x S99 ≤ Total Score < 0.80 x S99
D: 0.60 x S99 ≤ Total Score < 0.70 x S99
F: Total Score < 0.60 x S99 or if you fail to complete 10 of the 12 lab
projects”
This is the explanation the department of chemistry for my college gives. But I don’t understand, so please explain it to me like I’m five.
In: Mathematics
You are in college and don’t understand percentile? Or the motivation for using percentiles in grading? Take 100 random humans and measure their height. Arrange them from shortest to tallest. The guy at the end (the tallest one) is in the 99th percentile – he is taller than 99 other guys. Him and the 9 guys preceding him are in the 90th percentile: they are all taller than 90% of the sample (remaining 90 guys) etc etc etc. If you want to grade them, you define grades A: 99>x>=90th percentile; B: 60>x>=89 and so on.
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