In a city with three high schools, all of the ninth graders took a standardized test, with these results Glenwood 80 271 Central city 91 306 Lincoln High 67 186 The city's Pr Manager, who never took statistics, claimed the mean score of all ninth graders in the city was 79.3. Of course, that is incorrect. What is the mean score for all ninth graders in the city?
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