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Probability A student is taking a standardized test consisting of multiple-choice questions, each of which has five choices. The test taker earns 1 point for

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Probability

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A student is taking a standardized test consisting of multiple-choice questions, each of which has five choices. The test taker earns 1 point for each correct answer, - point is subtracted for each incorrect answer. Questions left blank neither receive nor lose points. Find the expected value of randomly guessing an answer to a question. -1/15 -4/15 1/15

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