Asked by Emily
A class consists of 55% boys and 45% girls. It is observed that 25% of the class are boys and scored an A on the test, and 35% of the class are girls and scored an A on the test.
If a student is chosen at random and is found to be a girl, the probability that the student scored an A is __?
If a student is chosen at random and is found to be a girl, the probability that the student scored an A is __?
Answers
Answered by
oobleck
since 45% are girls, and 35% are girls with A, then
P(A|girl) = 35/45 = 7/9
P(A|girl) = 35/45 = 7/9
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