## JordiPedroza Group Title 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 9 months ago 9 months ago

1. phi Group Title

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

2. JordiPedroza Group Title

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

3. JordiPedroza Group Title

i mean .084/.49

4. phi Group Title

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