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In a city with three high schools all the ninth graders took a Standardized Test...

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In a city with three high schools all the ninth graders took a Standardized Test with these results Mean score on test Number of ninth graders High School Glenwood 76 90 69 253 315 157 Central City Lincoln High The city s PR manager who never took statistics claimed the mean score of all ninth graders in the city was 78 3 Of course that is incorrect What is the mean score for all ninth graders in the city Round to one decimal place mean of all ninth grader s scores

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