Lets say a person decided to randomly fill in a scantron of 50 questions with 4 choices each. After submitting it to be graded, the result was 42% correct. How would we figure out the probability of this occurring completely by chance?
This problem actually came up while I was watching a show. I would assume that a probability test is to be used here. Observed is 21, while the expected is 12.5 questions. How would one go from here?