How common is school bullying?

Bullying is so prevalent that states are passing anti-bullying laws. Indiana did so in 2005. Indiana Code 20-33-8 defines bullying as,

“overt, repeated acts or gestures, including

(1) verbal or written communications transmitted;

(2) physical acts committed; or
(3) any other behaviors committed;

by a student or group of students against another student with the intent to harass, ridicule, humiliate, intimidate, or harm the other student.