One class contains 5 girls and 10 boys and a second class contains 13 boys and 12

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One class contains 5 girls and 10 boys and a second class contains 13 boys and 12 girls. A student is randomly picked from the second class and transferred to the first one. After that, a student is randomly chosen from the first class. What is the probability that this student is a boy?
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Mathematical Statistics With Applications In R

ISBN: 9780124171138

2nd Edition

Authors: Chris P. Tsokos, K.M. Ramachandran

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