Occasionally students ask if I “grade on a curve”. By this they usually mean, do I add extra points to everyone’s test scores if the whole class does poorly. The phrase grading on a curve really means to assign grades based on a normal distribution. Assume I give a test with a mean score of 84 and a standard deviation of 10. Draw a sketch of a normal distribution centered at the mean of 84 and divide it into 5 regions based on the following grades: The top 10% of scores receive an A The next 20% of scores receive a B The middle 40% of scores receive a C The next 20% of scores receive a D The bottom 10% of scores receive an F Find the minimum scores on the test that would give a student an A, B, C and D.
. Occasionally students ask if I “grade on a curve”. By this they usually
Assume I give a test with a mean score of 84 and a standard deviation of 10. Draw a sketch of a normal distribution centered at the mean of 84 and divide it into 5 regions based on the following grades:
The top 10% of scores receive an A The next 20% of scores receive a B The middle 40% of scores receive a C The next 20% of scores receive a D The bottom 10% of scores receive an F
Find the minimum scores on the test that would give a student an A, B, C and D.
You should have 4 answers (there is no lowest F other than 0).
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