LordoftheMilk said:
Why wouldn't farmer have int 4?
Not saying he wouldn't, but a farmer with Int 4, would likely be able to do simple math, and also read simple sentences.
I don't want to go into a discussion of "But but... a Int 5 person wouldn't naturally be able to read!!!", no just like a strength 6 person wouldn't naturally be good at fighting, and a WP 5 wouldn't naturally be resistant to seduction.
It's a rough guide line I suggested, not a whole rule set to deal with literacy...