SOLUTION: A class in advanced physics is composed of 10 juniors, 30 seniors, and 10 graduate students. The final grades show that 3 of the juniors, 10 of the seniors, and 5 of the graduate s

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Question 1159395: A class in advanced physics is composed of 10 juniors, 30 seniors, and 10 graduate students. The final 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?
Answer by ikleyn(52754) About Me  (Show Source):
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ANSWER.  The probability under the problem's question is  P = 10%2F%283%2B10%2B5%29 = 10%2F18 = 5%2F9 = 0.555 = 55.5% (approximately).