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.

The correct mean score of all ninth graders of the city is 81.84 marks and not 79.

Given information:

The city has three schools: Glenwood, Central city, and Lincoln high.

The score of three schools is:

So, the mean score of the city can be calculated as,

Therefore, the correct mean score of all ninth graders of the city is 81.84 marks and not 79.

For more details, refer to the link:

link

The mean score for all ninth graders in the city is 82.73.

Step-by-step explanation:

We find the weighed mean to find the mean of all ninth graders in the city, that is, we multiply the mean for each high schools by the number of students in the high school, add them, and then divide by the total number of students. So

The mean score for all ninth graders in the city is 82.73.

no association

step-by-step explanation:

if you have eyes and you can use them efficiently you can see that it just looks like random dots like do a line of best fit and like they're so spread out it's such a weak association you might as well consider it nonexistent

answer: yes, since the line has a steeper rate of change than the exponential the y-values will be greater and they will only intersect one time.