Question

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

Answer 1

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

Answer 2

cool, I did that.

.84/.49=.171

Answer 3

i mean .084/.49

Answer 4

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