A multiple-choice quiz has 15 questions, each with 4 possible answers of which only 1 is the correct answer. Suppose a student has been absent for the past meetings and has no idea what the quiz is all about. a. What is the probability that the student will get a perfect score? b. What is the probability that the student will get at least 3 correct answers? c. What is the student's expected number of correct answers?
Added by Jennifer U.
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To get a perfect score, the student needs to answer all 15 questions correctly. Since each question has 4 possible answers and only 1 is correct, the probability of getting a question correct is 1/4. Show more…
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