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47. Only tenth-, eleventh-, and twelfth-grade students
attend Washington High School. The ratio of tenth
graders to the school’s total student population is
86:255, and the ratio of eleventh graders to the
school’s total student population is 18:51. If 1 student
is chosen at random from the entire school, which
grade is that student most likely to be in?
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A. Tenth
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B. Eleventh
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C. Twelfth
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D. All grades are equally likely.
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E. Cannot be determined from the given information