algebra

A math class has 3 girls and 7 boys in the seventh grade and 2 girls and 2 boys in the eighth grade. The teacher randomly selects a seventh grader and an eighth grader from the class for a competition. What is the probability that the students she selects are both boys?

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  1. Prob(boy from 7th grade) = 7/10
    Prob(boy from 8th grade) = 2/4 = 1/2
    Prob(2 boys) = (7/10)(1/2) = 7/20

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  2. A math class has 3 girls and 5 boys in the seventh grade and 2 girls and 2 boys in the eighth grade. The teacher randomly selects a seventh grader and an eighth grader from the class for a competition. What is the probability that the students she selects are both boys?

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  3. A math class has girls and boys in the seventh grade and girls and boys in the eighth grade. The teacher randomly selects a seventh grader and an eighth grader from the class for a competition. What is the probability that the students she selects are both girls?
    Write your answer as a fraction in simplest form.

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