- #1
Samwise_geegee
- 6
- 0
Homework Statement
Let x and y be independent random variables with E[x]=1, E[y]=-1, var[x]=1/2, var[y]=2
Calculate E[(x+1)2(y-1)2]
Homework Equations
E[x]=1=μ
E[y]=-1=μ
var[x]=1/2 =E[(x-μ)2]
var[y]=2=E[(x-μ)2]
The Attempt at a Solution
Since x and y are independent,
E[(x+1)2(y-1)2]=E[(x+1)2]*E[(y-1)2]
var[x]=1/2=E[(x-1)2]
var[y]=2=E[(y+1)2
The signs in the equation I need to solve are throwing me off. I feel like I'm missing something simple. Any help is appreciated!