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<p>To me this is a good argument for grading on a curve. My son’s school is on the 90-80-79-60 scale, but most teachers use extra credit and extended deadlines liberally in order to ensure a fair balance of final grades. The percentages give the false impression of objectivity. I say, lose the artifice and just use A=best, B=above average, C=average, etc. If 26 is average, then 26 is a C. So be it. Why not?</p>