Question 10 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 Glenwood 83 258 Central City 96 325 Lincoln High 71 162 The city's PR manager, who never took a college math class, claimed the mean score of all ninth graders in the city was 83.3 . 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 = Question Help: () Message instructor Submit