Question: I don't know how to work this problem. On a large campus 18% of students surveyed said they spend less than an hour a night

I don't know how to work this problem. On a large campus 18% of students surveyed said they spend less than an hour a night studying. If three students are picked at random, what's the probability that all three spend less than an hour a night studying? What's the probability that two of the three do?

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