whyschool whyschool

25-02-2017
Mathematics

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A science class has 5 girls and 7 boys in the seventh grade and 5 girls and 5 boys in the eighth grade. The teacher randomly selects a seventh grader and an eighth grader from the class for a compettion. What is the probability that the students she selects are both boys?

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LamZhaoWei LamZhaoWei

25-02-2017

p(the students she selects are both boys)=7/12×5/10=35/120=7/24

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