Thread: Quick conditional probability question
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Old November 4th, 2009, 03:33 PM
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Default Quick conditional probability question
Given f(y)= 2y^{-3} , if y\geq\\ 1 and 0 otherwise, the probability

P(2\leq\\Y\leq\\4|Y\geq\\3)=?

I was thinking, P(2\leq\\Y\leq\\4|Y\geq\\3)=\frac{P(2\leq\\Y\leq\\4\cap\\Y\geq\\3)}{P(Y\geq\\3)}=\frac{P(2\leq\\Y\leq\\4}{P(Y\geq\\3)}.

I drew out the cdf and shaded the regions in question, but I am not sure how to treat the numerator.

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Last edited by Danneedshelp; November 4th, 2009 at 05:49 PM.
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