medium · SAT Math
A survey of 150 high school students recorded each student's grade level and preferred reading genre, summarized in the table below. | Fiction | Nonfiction | Total 9th grade | 45 | 30 | 75 10th grade | 25 | 50 | 75 Total | 70 | 80 | 150 If a student is selected at random from those who prefer Nonfiction, what is the probability that the student is in 10th grade? Express your answer as a fraction in simplest form.
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