jt512
Aug 22, 2002, 7:25 PM
Post #26 of 26
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Registered: Apr 12, 2001
Posts: 21904
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Actually, there is a serious and straightforward historical answer to your original question. When the letter sub-grades were introduced, it was felt that the then-existing 5.10s had a range of difficulty equivalent to three number grades, so naturally they used 3, er, 4 letters to subdivide 5.10. Consequently, the relative difference between two letter subgrades should be equivalent to the relative difference between 3/4 of a number grades -- at least that was the intent.
-Jay
[edit to correct 8th grade math error - Doh]
[ This Message was edited by: jt512 on 2002-08-23 17:45 ]
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