On a multiple-choice test, the chance of randomly guessing the correct answers to a question is 25%. If you guess the answer to every question on a 20-question test, how many should you expect to get correct?

Answer 1

Since there are four possible answers to each question and only one is correct, the probability of guessing the correct answer is 1/4 or 25%.

If you guess on each of the 20 questions, you can expect to get 20 x 0.25 = 5 questions correct on average.

Therefore, you should expect to get 5 questions correct by guessing on a 20-question multiple-choice test.