" he thought that the difference between, say, a ninety-five and a ninety-six, would be so tiny, and so subjective, that it really wouldn’t mean anything at all. That’s why he grouped his ratings in fives, which he categorized by letters of the alphabet. ‘A’ at the top end, ‘F’ at the bottom. So that an ‘A’ would be like ninety-five to a hundred, ‘B’ would be ninety to ninety-five. "
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