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To find the relative frequency of the percent of 7th graders who prefer mountains, you need to divide the number of 7th grade students who prefer mountains by the total number of students:
40 / 310 = 0.129
Multiply by 100 to get the percentage:
0.129 * 100 = 12.9%
So, the relative frequency of the percent of 7th graders who prefer mountains is 12.9%, rounded to the nearest tenth.