Answer:
according to the text, it is very unclear, but due to research and knowledge of mental illnesses, the answer is likely to be no.
Step-by-step explanation:
The text does directly give an answer to this question, but research of symptoms that are shown by the narrator in "The Tell-Tale Heart" could lead to the assumption that he has schizophrenia, and was struck by a schizophrenic episode. This would mean that he probably did not know right from wrong.