MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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In a city with three high schools, all the ninth graders took a Standardized Test, with these results:
High School | Number of ninth graders (Frequency) | |
---|---|---|
Glenwood | 78 | 258 |
Central | 96 | 303 |
Lincoln | 69 | 159 |
The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was the average of 78, 96, and 69, which is 81. 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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