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Homework Help: Probability Question. Find the probability that F_{X}(x) will be less than 1, etc

  1. May 7, 2012 #1
    1) (1 pt) You are investigating a random phenomenon and have determined that the cumulative distribution function F_{X}(x):=P(X<x) of the random variable X has values F_{X}(1)=.5, F_{X}(2)=.74, F_{X}(3)=.92

    A) Less than 1 _____

    B) Larger than 2 _____

    C) Between 1 and 3 _____

    2) Equations: None that I know of that pertain to this particular problem.

    3) Part A:

    So... 0.5/2.16=0.23148 Or 23.148%

    I tried this for each part. I'm looking through my notes but they only have probability questions with equations.
  2. jcsd
  3. May 7, 2012 #2


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    Homework Helper

    You're given the cumulative distribution function (CDF). That gives the probability that X will be LESS than a given value x.

    So what does [itex]F_X(1)[/itex] signify? The answer to part a) is immediate.

    Can you now figure out the other two parts?
  4. May 11, 2012 #3
    Solved. Thank you!
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