Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Probability Density Functions

  1. Apr 28, 2010 #1
    1. The problem statement, all variables and given/known data
    The number X is chosen at random between 0 and 1. Determine the probability density function of each of the random variables v=X/(1-X) and W=X(1-x).

    2. Relevant equations

    3. The attempt at a solution
    The solution in the back of the book says "The random Variable V satisfies P(V< or = v) = P(X< or = v/(1+v)) = v/(1+v) for v > or = 0. Its density function is equal to 1/((1+v)^2) for v>0 and 0 otherwise. The random variable W satisfies P(W < or = w) = 1-sqrt(1-4w) for 0< or = w< or = (1/4) and its density function is equal to 2(1-4w)^(-1/2) for 0<w<(1/4) and 0 otherwise. Can someone walk me through the steps to get to this solution?
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted