In a city with three high schools, all the ninth graders took a Standardized Test, with these results:High SchoolMean score on testNumber of ninth gradersGlenwood78258Central City92335Lincoln High66186The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 78.7 . Of course, that is incorrect. What is the mean score for all ninth graders in the city? Round to one decimal place.

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Description: In a city with three high schools, all the ninth graders took a Standardized Test, with these results:High SchoolMean score on testNumber of ninth gradersGlenwood78258Central City92335Lincoln High66186The city's PR manager, who never took statistics,

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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	78	258
Central City	92	335
Lincoln High	66	186

The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 78.7 . Of course, that is incorrect. What is the mean score for all ninth graders in the city? Round to one decimal place.

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