Suppose a biology student is about to take an exam that is entirely multiple choice, where each question has 5 answer choices. This student only studied 60% of the material that is covered on this exam, so let us assume that there is a 60% chance that she knows the correct answer to any given question. If she does not know the answer, she will choose an answer at random.

If she answered a question on the exam correctly, what is the probability it was just because she guessed?