7th Grade Math Quiz
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STATISTICS AND PROBABILITY
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A researcher wants to estimate the average number of books read per year by students at Lincoln Middle School. She randomly selects 30 students and finds their average is 8.2 books per year. To check the reliability of this estimate, she takes four more random samples of 30 students each, obtaining averages of 7.8, 9.1, 8.5, and 7.6 books per year. Based on all five samples, what is the most reasonable prediction for the population mean?
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