In a city with three high schools, all the ninth graders took a Standardized Test, with these results: High School Mean score on test Number of ninth graders 270 79 95 305 Glenwood Central City Lincoln High 67 187 The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 80.3. Of course, that is incorrect. What is the mean score for all ninth graders in the city? Mean of all ninth grader's scores = Round to 2 places