【Answer】Solution: According to the analysis, since there are only 12 teachers in total, "no more than 12" is correct;
"no more than 2" and "no less than 3" are mutually exclusive, similarly "no more than 4" and "no less than 5",
"no more than 6" and "no less than 7", "no more than 8" and "no less than 9",
"no more than 10" and "no less than 11" are also mutually exclusive. Among these 10 guesses, only 5 are correct:
$$
1+1+5=7 \text { (people) }
$$

Therefore, the answer is: 7.
5. (6 points) 12 question setters make guesses about the answer to this question, with their guesses being “not less than 1”, “not greater than 2”, “not less than 3”, “not greater than 4”, “not less than 11”, “not greater than 12” (“not less than” followed by an odd number, “not greater than” followed by an even number). The number of question setters who guessed correctly is $\qquad$ people.