An elementary school teacher wants to know if problems on a math worksheet are too difficult for students. She solves the first and last problem in every row and finds two problems that would be difficult for her students. What is the sample in this situation?
A) every problem on the worksheet
B) every problem that she did not solve
C) the two problems that would be difficult for her students
D) the first and last problem in every row

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C.

D.
The sample is where data is taken from.

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