Problema Solution
Holly is taking a multiple choice reading test. She has decided to guess on questions 3 and 7. On each question, there are four worded choices plus an "all of these" choice and a "none of these" choice. What is the probability that she answers question 3 incorrectly and question 7 correctly?
Answer provided by our tutors
the probability of getting one question right is: 1/6
the probability of getting one question wrong is: 5/6
the probability that she answers question 3 incorrectly and question 7 correctly is:
(1/6)*(1 - (1/6)) = (1/6)(5/6) = 5/36 = 0.139 or 13.9%