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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

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, 1/3 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

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