2
QuizMultiple Choice

Comparing Box Plots — Unit test

Question 2 • Math 7 B (M12 25/26 S2)

Chin researched the amount of money 150 students earned per month from jobs held during the summer. He created a table of six sample means from his collected data. Sample NumberSample Mean ($)120822353245420752056210Using his results, what is a valid prediction about the mean of the population?

Answer
A
The predicted mean of the population will be less than 200.
B
The predicted mean of the population will be less than 245.
C
The predicted mean of the population will be more than 275.
D
The predicted mean of the population will be more than 250.

Explanation

The six sample means are $208, $223, $245, $207, $256, and $210. Their average is $224.83, so a reasonable prediction for the population mean is about $225. This is less than $245, making choice B valid; it is not necessarily less than $200.

AI-written and checked against the verified answer.

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