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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?

  • A. Tenth

  • B. Eleventh

  • C. Twelfth

  • D. All grades are equally likely.

  • E. Cannot be determined from the given information