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To find the probability that an eighth grade student will NOT be selected, we first need to count the total number of students and then count the number of eighth grade students.
Total number of students = 9
Number of eighth grade students = 3
Therefore, the probability that an eighth grade student will NOT be selected is:
(9 - 3) / 9 = 6/9 = 2/3
As a percentage, this would be:
2/3 = 66.67%