In a city with three high schools, all the ninth graders took a standardized test, with these results:

In a city with three high schools, all the ninth graders took a Standardized Test, with these results: High School Mean Test Score Number of ninth graders (Frequency) Glenwood 84 286 Central 95 346 Lincoln 72 161 The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was the average of 84, 95, and 72, which is 83.7. 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 = 174 X Hint: Textbook Measures of Center Question Help: B Written Example Message instructor Submit Question Jump