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In a city with three high schools, all the ninth graders took a Standardized Test, with...

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 79 273
Central City 94 330
Lincoln High 73 174
The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 82 . 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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Answer #1

salobion Here we have to find the meam at all ninth graderts Scores from the given data: X fx a 79 213 21567 94 330 31020 73

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