## 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

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 of ninth gradersGlenwood 78 269Central City 93 321Lincoln High 66 161The city’s PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 79 . Of course, that is incorrect.

a. What is the mean score for all ninth graders in the city? Round to two decimal places.

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2 weeks 2021-11-14T00:52:39+00:00 2 Answers 0 views 0

Mean score is 81.83

Step-by-step explanation:

Mean high score for the following schools and number of students:

Glenwood:        Score = 78      ,      Students = 269

Central City:      Score = 93      ,      Students = 321

Lincoln High:     Score = 66      ,      Students = 161

Mean score = total score / total number of students

Total score = (78 * 269) + (93 * 321) + (66 * 161) = 61,461

Total students = 269 + 321 + 161 = 751

Mean score = 61,461 / 751 = 81.83 