Answer:
This answer depends on your experiences, but I'll explain it.
Step-by-step explanation:
A preconceived notion is prejudice, a judgement made before you really know something.
For example, say you saw a lanky guy in baggy jeans and a dark, low beanie walk to you. You may expect him to hurt you, because that's what some people assume persons like that to do.
However, instead of hurting you, he shakes your hand and has a great conversation with you. You leave with his contact info, because you just made a friend.
This is an example of a preconceived notion being incorrect. Hope it helps!