Eli5: In American schools, the letter grading scheme is: A,B,C,D and F. Why did it skip the letter E?

Question

I was wondering why the letter grading scheme is like this. Why did it skip the letter E?

In: Other

Answer 1

Once upon a time, in a land without computers, grade cards were handwritten, sent home with the student, signed by a parent and returned to the teacher. An “F” could easily be made into an “E”.