Question: A student is taking a multiple-choice test in which each question has four possible answers. She knows the answers to 50% of the questions, can

A student is taking a multiple-choice test in which each question has four possible answers. She knows the answers to 50% of the questions, can narrow the choices down to two 30% of the time, and does not know anything about 20% of the questions. What is the probability she will correctly answer a question chosen at random from the test?

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