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## JordiPedroza one year ago The probability that a student takes an English class and a math class is 0.084. The probability that a student takes an English class is 0.49. What is the probability that a student takes a math class given that the student is taking an English class? 0.084 0.406 0.49 0.171 I am confused because of the last sentence. I think the answer is .171

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1. phi

you need to use the formula for conditional probability http://www.mathgoodies.com/lessons/vol6/conditional.html

2. JordiPedroza

cool, I did that. .84/.49=.171

3. JordiPedroza

i mean .084/.49

4. phi

Yes, $Pr(M | E) = \frac{Pr(M \& E)}{Pr(E)}$

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