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Mathematics 18 Online
OpenStudy (anonymous):

Selma wants to know if seventh grade students prefer to do their math homework in silence or with background music. She polled the 21 students in her music class. Seven students preferred to do their math homework in silence, and fourteen students preferred to do their math homework with background music. Identify the sample size in the situation above. A.14 B.There is not enough information. C.21 D.7

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