In a multiple choice test. Supposed that a candidate knows the answer to three quarter of the questions and guess the remaining one quarter. When he knows the answer he has the probability of 0.95 of making the answer correct. Each question has 4 possible answers of which only one is correct.
I. Find the probability of the candidate obtaining correct answer to the question
II. If the candidate obtain the correct answer to the question, find the probability that he knows it.
