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Homework Help: CDF to PDF problem (probability)

  1. Oct 24, 2014 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations
    integral from -inf to inf of fx(x)dx = 1, fx(x)=PMF

    3. The attempt at a solution
    I get values for probability function PMF of:
    0.3, x=0
    0.3, x=2
    A-0.6, x=3

    I guess I try to find area under curve of PMF which will be equal to 1. (0.3)(2) + (1/2)(1)(A-0.6-(0.3))=1 -> A=1.7
    Am I doing it right?
  2. jcsd
  3. Oct 24, 2014 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Don't think so.

    (a) what must be the value of F(y) for y → ∞?
    (b) since PMF(y) = f(y) = (d/dy)F(y), how must the PMF graph look?
    (c) what's the formula for expectation of a distribution f(y)?
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