Posted by **Michelle** on Tuesday, August 16, 2011 at 1:28am.

For a class actvitity, your group has been assigned the task of generating a quiz question that requires use of the formuala for conditional probability to compute P(B|A). Your group comes up with the following question: "If P(A and B) = 0.40 and P(A) = 0.20, what is the value of P(B|A)?" What is wrong with this question? Hint: Consider the answer you get when using the correct formual, P(B|A) = P(A and B)/P(A).

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