1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Conditional normal distribution

  1. May 7, 2013 #1
    1. The problem statement, all variables and given/known data

    We have two normally distributed random variables:

    A = N(129, 29.4)
    B = N(86, 24.0)

    What is the probability A is atleast twice the size of B?

    3. The attempt at a solution

    P(A > 2B | B = b) or something? I think we are supposed to use the CLT somehow but I don't know how when it's conditional...
  2. jcsd
  3. May 7, 2013 #2

    Ray Vickson

    User Avatar
    Science Advisor
    Homework Helper

    In the notation N(a,b), is b the variance or the standard deviation? I have seen both conventions used, so you need to tell us which one you mean. Also: are A and B independent?---you need to tell us that, too.
  4. May 7, 2013 #3
    b is the stdev. A and B are independent. Sorry!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Discussions: Conditional normal distribution
  1. Normal distribution (Replies: 2)

  2. Normal Distribution? (Replies: 2)