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?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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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?

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