IMSE 317/ BENG 364 - Fall 2015
IMSE 317/ BENG 364 - Fall 2015 HW #3
Due on Nov 11, 2015
Problem 1:
The joint probability density of X and Y is given by 𝑓!,! 𝑥,𝑦 = ! ! 𝑥! + !"
! , 0 < 𝑥 < 1, 0 < 𝑦 <
2. Find: a) Verify that this is a joint probability density function. b) Find 𝑃[𝑋 > 𝑌] c) Find 𝑃 𝑌 > !
! 𝑋 < !
!
d) Find Cov(X, Y) e) Find Correlation Coefficient of X and Y.
Problem 2:
The joint probability mass function of the random variables X, Y and Z is
𝑝 1,2,3 = 𝑝 2,1,1 = 𝑝 2,2,1 = 𝑝 2,3,2 = 1 4
a) E[XYZ] b) E[XY+XZ+YZ]