Hi,

62 students. Of these, 34 are sophomores, 35 are psychology majors, and 7 are neither

 62-7 = 55 students are sophmores, psyc majors or both

 34 + 35 = 69 - 55 = 14 are both

a) What is the probability that the student is both a sophomore and a psychology major? 

 (b) Given that the student selected is a sophomore, what is the probability that he is also a psychology major?

 P =  

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