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Mathematics 14 Online
OpenStudy (anonymous):

The A.P. Statistics exam consists of a multiple-choice section where each question has five choices. Sara estimates that she has a 75% chance of knowing each question. If she does not know the answer, she will randomly guess. a) What is the probability of Sara getting a question correct? b) The A.P. exam has 40 questions, how many might Sara expect to get correct?

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