N an after school program, students must choose to either play on the playground or read a book silently. On one cloudy day, 70% of the students chose to play on the playground, and the rest chose read a book silently. 60% of the students who went to the playground are boys, and 20% who stayed inside to read a book are boys. If a student is randomly selected on this day, what is the probability that the student is a girl?

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19 February, 22:11

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Andreas Salinas · Answer 1

20% b/c

70% playground - 60% boys = 10%girls

100% total-70% playground = 30% inside

30% inside-20% boys = 10%girls

10%girls + 10% girls=20%girls