Question: in a city with three high schools all the ninth...
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|
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