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 | 80 | 272 || Central City | 94 | 335 || Lincoln High | 72 | 178 |The city's PR manager, who never took a college math class, 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 graders' scores = [ ]### Explanation:To find the correct mean score for all ninth graders, calculate the weighted average of the scores from each school, considering the number of students:1. Multiply the mean score of each school by the number of students.2. Add these products together.3. Divide the total by the number of all ninth graders from all schools.Here's the calculation step-by-step:- Glenwood: 80 * 272 = 21,760- Central City: 94 * 335 = 31,490- Lincoln High: 72 * 178 = 12,816Total sum of scores = 21,760 + 31,490 + 12,816 = 66,066Total number of students = 272 + 335 + 178 = 785Mean score = 66,066 / 785 = 84.2 (rounded to one decimal place)So, the mean score for all ninth graders in the city is 84.2.

Given information: Mean score on test Number of ninth graders Glenwood 80 272 Central city…

Answered: In a city with three high schools, all…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Use the following results from a test for marijuana use, which is provided by a certain drug testing company. Among 142 subjects with positive test results, there are 27 false positive results. Among 151 negative results, there are 2 false negative results. Complete parts (a) through (c). (Hint: Construct a table.) a. How many subjects were included in the study? The total number of subjects in the study was b. How many subjects did not use marijuana? A total of subjects did not use marijuana. c. What is the probability that a randomly selected subject did not use marijuana? The probability that a randomly selected subject did not use marijuana is: (Do not round until the final answer. Then round to three decimal places as needed.)
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