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The relative frequency of students who prefer dogs who are 7th graders is 23.5%.
To calculate this, we first find the total number of 7th graders who prefer dogs, which is 8. Then we divide this by the total number of students (7th graders and 8th graders combined) who prefer dogs, which is 8 + 26 = 34.
So, (8/34) * 100 = 23.5%