A rhetorical question is a question of which the answer is already implied or assumed to be so widely known that actually answering it is left unnecessary.

A rhetorical question is a figure of speech in the form of a question posed for its persuasive effect without the expectation of a reply. Rhetorical questions encourage the listener to think about what the (often obvious) answer to the question must be. When a speaker states, "How much longer must our people endure this injustice?", no formal answer is expected.

Yes you are right. rhetorical questions are questions you don't really expect an answer to when you ask them. For example: "If your friend jumped off the bridge would you do it too?" "You don't think I'm that stupid, do you?" "Are you kids still awake in there?"

Sertan is correct. A rhetorical question is a question to which the answer is already known or assumed to be known.

ok, seems everyone knows it, hahh