Question
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
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 | 253 |
| Central City | 96 | 341 |
| Lincoln High | 68 | 170 |
The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 80.7 . Of course, that is incorrect.
What is the mean score for all ninth graders in the city?
Mean of all ninth grader's scores = Round to 2 places
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Microeconomics An Intuitive Approach with Calculus
Authors: Thomas Nechyba
1st edition
538453257, 978-0538453257
