This question illustrates conditional probability where the condition defines the group.
\( \begin{array}{l}\text{A group of 30 students includes 18 girls and 12 boys.} \\ \text{If a student is chosen at random, what is the probability that the student is a girl,} \\ \text{given that the student is not a boy?}\end{array} \)
Choose one option:
Focus on the subset defined by the condition; the probability is then calculated within it.
Only the students meeting the condition (not a boy) are considered for probability.
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