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11-64.

A copy machine company advertises that its copiers will make at least 25,000 copies before requiring maintenance. A consumer research group tested the claim by collecting data from users of the particular copy machine in 30 different regions of the country. The means for each of the 30 regions are listed in the table below. Homework Help ✎

24928

24574

24652

24758

24691

24893

25024

24767

24791

24609

25249

24914

24895

24656

24883

24551

24928

25025

24798

25041

24782

25020

24618

24904

24764

24705

24889

24656

24600

24735

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Find the upper and lower 5% 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.