Critical Thinking For a class activity, your group has been assigned the task of generating a quiz question that requires use of the formula for conditional probability to compute P(B | A). Your group comes up with the following question: “If P(A and B) 5 0.40 and P(A) 5 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 formula, P(B | A) 5P(A and B)/P(A).

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