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 79 279 Central 94 349 Lincoln 70 161 The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was the average of 79, 94, and 70, which is 81. 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 =

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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 Test Score
Number of ninth graders (Frequency)
Glenwood
79
279
Central
94
349
Lincoln
70
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 79, 94, and 70, which is 81. 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 =
Transcribed Image Text: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 79 279 Central 94 349 Lincoln 70 161 The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was the average of 79, 94, and 70, which is 81. 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 =
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