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A copy machine company advertises that its copiers will make at least copies before requiring maintenance. A consumer research group tested the claim by collecting data from users of the particular copy machine in different regions of the country. The means for each of the regions are listed in the table below.


Find the upper and lower bounds of the sample-to-sample variability and predict the number of copies that can be made before a machine requires maintenance. Do you think the consumer research group will support the company’s claim?

Read the Math Notes box in Lesson 11.2.2.