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Example 2.14. Professor May B. Right often has her facts wrong, and answers each of her
students' questions incorrectly with probability 1/4, independent of other questions. In each
lecture, May is asked 0, 1, or 2 questions with equal probability 1/3. Let X and Y be the number of
questions May is asked and the number of questions she answers wrong in a given lecture,
respectively. Compute the probability of at least one wrong answer. 12/48 11/48 9/48

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  • 1. Example 2.14. Professor May B. Right often has her facts wrong, and answers each of her students' questions incorrectly with probability 1/4, independent of other questions. In each lecture, May is asked 0, 1, or 2 questions with equal probability 1/3. Let X and Y be the number of questions May is asked and the number of questions she answers wrong in a given lecture, respectively. Compute the probability of at least one wrong answer. 12/48 11/48 9/48