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Some of the earliest letter grading systems did, in fact grade on an A - E scale, but as letter-based grading became for refined, the E was dropped in favor of F. Part of the reason for this is that a system of "E" (excellent) "S" (satisfactory) "N" (needs improvement) and "U" (unsatisfactory) was also in use, and, it seems, the "E" was dropped from the A - F system to avoid confusion - F clearly stands for FAILURE.

In some modern cases, the S N U E grading system is still used, to some degree of variation.

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10y ago
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Q: Why is there no E on the grading scale?
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