A class in advanced physics is composed of 10 juniors, 30
Chapter 3, Problem 2.74(choose chapter or problem)
A class in advanced physics is composed of 10 juniors, 30 seniors, and 10 graduate students. The nal grades show that 3 of the juniors, 10 of the seniors, and 5 of the graduate students received an A for the course. If a student is chosen at random from this class and is found to have earned an A, what is the probability that he or she is a senior?
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