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A quiz consists of 770 true or false questions. If the student guesses on each question, what is the mean number of correct answers?

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A quiz consists of 770 true or false questions. If the student guesses on each question, what is the mean number of correct answers?​

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Another question on Mathematics

A quiz consists of 770 true or false questions. If the student guesses on each question, what is the mean number of correct answers?