Outliers: The Art of Deciding Whether That 3,000 kg Penguin Is a Data Entry Error or an Actual Monster

Most penguins weigh 5-15 kg. Your dataset has one at 3,000 kg. Is it a typo? A mislabeled elephant? A terrifying mutant? Or did someone actually discover a penguin the size of a car? How you answer determines whether your model captures reality or hallucinates nonsense.