Question: in a city with three high schools all the ninth...
Question details
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 | 82 | 264 |
| Central City | 96 | 317 |
| Lincoln High | 68 | 188 |
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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