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 83 252

Central City 94 301

Lincoln High 72 158

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 . 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 =