Normal, Extreme, Unexpected - these words have a meaning only in a context.
If we're talking about cars, "Going" is normal, "Screaming" is extreme, "Crashed into the wall" is unexpected.
If we're talking about the brake on your bike, these words have completely different meaning.
So, this is not VB problem. Is "sdflgkjhsdflgkjsldfgj' normal, extreme or unexpected?
If you are talking about numbers, and statistics / probability, that is completely different game, and there the players are usually numbers, not strings.