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!

Homework Help: Expected values

  1. Dec 16, 2004 #1
    ok, so to find the expected value of fy(Y) = 3(1-y)^2 for 0 <= 1 <= 1

    I thought the formula is y * fy(Y) which is the intgeral from 0 to 1 of y* 3(1-y)^2. right?

    the book says the answer is 1/4....but I get a whole number answer.......
     
  2. jcsd
  3. Dec 16, 2004 #2
    Hi,

    I did the integral of y*f(y) from 0 to 1 and got the answer 1/4...double check your calculation....This is what I did:

    Int[3*(1-y)^2] = 3*Int[y^3-2y^2+y] from 0 to 1
     
  4. Dec 16, 2004 #3
    oops, I forgot the y in the 1st integral expression
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook