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24 January, 15:40

A math class has 3 girls and 9 boys in the seventh grade and 7 girls and 3 boys in the eighth grade. The teacher randomly selects a seventh grader and an

eighth grader from the class for competition. What is the probability that the students she selects are both girls?

Write your answer as a fraction in simplest form.

+1
Answers (1)
  1. 24 January, 15:49
    0
    7/40

    Step-by-step explanation:

    There are 3 girls+9 boys = 12 students in the 7th grade

    P (girl in 7th grade) = girls / total

    = 3/12 = 1/4

    There are 7 girls+3 boys = 10 students in the 8th grade

    P (girl in 8th grade) = girls / total

    = 7/10

    P (7th grade girl, 8th grade girl) = 1/4 * 7/10 = 7/40
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