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Mathematics 9 Online
OpenStudy (anonymous):

In the past, a math teacher observed that for every 16 test questions she gives to her students, there are 5 wrong answers given by students. Over the next few months, she intends to give tests with a total of 640 questions. What is a reasonable prediction of the number of wrong answers selected by students on these tests?

OpenStudy (anonymous):

A 240 B 45 C 200

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