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- Aug 31st 2010, 03:08 AM #1

- Joined
- Mar 2010
- Posts
- 122

## PDF and CDF

Let X be a continuous random variable with PDF fX(x) = ce^{-|x|}

Let Y = |X|. Find the CDF of Y and deduce its PDF

I have gotten 1-e^-y for y>=0 as the cdf

someone showed me what they got which is sinhy;The problem that i see with this is that we need limit as the CDF approaches 0 to be zero which this fulfils, but also the limit as the cdf approaches infinity to be one which this does not fulfil. Anyway if someone could check what they get as a solution i would appreciate it.

- Aug 31st 2010, 03:21 AM #2