4 curves to save your math grades

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A lot of math teachers in Taiwan will take the square root of students' exam scores and then multiply by 10 to "help" the student pass their math exams, but why?! While I can only give you a math reason why it would help the student, I do not know why they choose to "curve the exam" like that. Thus, I will give you three more ways to "curve the exam" to help students pass the class. Let me know which way you like the most!

PS. As a calculus teacher in college, I do not do any of these : )
0:00 What does "can you curve?" really mean?
0:56 Check out DataCamp to learn about data science
2:34 1st curve: 10sqrt(x)
6:28 2nd curve: x+15
8:29 3rd curve: normal curve
11:49 4th curve: 20% of each letter grade
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