# How do you curve a grade with a square root?

## How do you curve a grade with a square root?

To curve you take the square root of the student’s grade and multiply it by 10. Looking at the example below, let’s say a student scored a 75 on their test. We take the square root of 75, which is about 8.666, and multiply it by 10 giving them an 86.6% curved grade.

## Is grading on a curve ethical?

Never grade on the curve. Grading on a curve is a based on a standard bell curve; we have to ask, is the “population” of this class large enough to conduct a statistically significant analysis. Grading on the curve breeds competition rather than collaboration.

## Is grading on a curve good?

Most of the time, grading on a curve boosts the students’ grades by moving their actual scores up a few notches, perhaps increasing the letter grade. Some teachers use curves to adjust the scores received in exams, whereas other teachers prefer to adjust what letter grades are assigned to the actual scores.

In traditional grading, students are primarily measured by the percentage of work successfully completed. The assumption is that higher completion rates reflect greater mastery, and earn higher grades. Often 90% achieves an A, 80% a B, etc. In SBG, grading is based on demonstration of mastery.

## Does Harvard grade on a curve?

Harvard grades everyone on a curve, and basically never gives lower than a B. They use “A+” as a system to identify the truly exceptional people. My point is that a professor should be able to write 20 questions that are relevant and interesting, and just look at the distribution of results to assign grades.

around 75%

## When should I curve an exam?

If the class does significantly lower than I think they should have, I will consider curving the exam. Also, courses have certain historical distributions. For example, in an entry-level course I may want an average (mean) of 80-82% with several A’s. In classes like that, failing grades are not unusual.