P(AB)
=
P(ANB)
P(B)
Freshmen
Sophomores
Juniors
Seniors
2.
1
3
Boys
Girts
7
5
P(Boy|Sophomore) = ? /?


PAB PANB PB Freshmen Sophomores Juniors Seniors 2 1 3 Boys Girts 7 5 PBoySophomore class=