Middle School

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There are 18 girls and 12 boys in your class. What is the probability that a new kid entering your class will be a boy?

Answer :

Let's assume that your class is a random sample of the school's students as a whole. In this case, the probability of a new child entering your class being male is the same as the probability of randomly picking a boy when you select a random student from the class. There are 12+18=30 students in the class, so the probability is 12/30=2/5.

Note that without this assumption, the probability is indeterminate. However, given that the question is listed under elementary school, I assume that they are expecting that assumption to be made.

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