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: Expected value of area

  1. Mar 25, 2008 #1
    1. The problem statement, all variables and given/known data

    Given a unit square and a 'target' square of size LXL = p^2 < 1 in the unit square. The center of target square in equally likely to be anywhere in the unit square. What is the average size of the target square as a function of p^2.

    This is the problem and I have included a jpeg illustration of the problem. Any help would be greatly appreciated.

    My attempt at the problem :

    I divided the problem into three cases : one where the target square is completely in the unit square : one where half the target square is in the unit square and one where quarter of the target square is in the unit square. I then calculated the expectation integral of p^2 but I am confused as to what the probability density function is and what the limits of integral are for each of the cases.
     

    Attached Files:

    • pic.jpg
      pic.jpg
      File size:
      6 KB
      Views:
      111
    Last edited: Mar 25, 2008
  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