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Question from Deltacourse
A business school club, Friends of Foam, is throwing a party
at a local bar. Of the business school students at the bar,
40% are first year students and 60% are second year
students. Of the first year students, 40% are drinking beer,
40% are drinking mixed drinks, and 20% are drinking both. Of
the second year students, 30% are drinking beer, 30% are
drinking mixed drinks, and 20% are drinking both. A business
school student is chosen at random. If the student is
drinking beer, what is the probability that he or she is
also drinking mixed drinks?