0 like 0 dislike
0 like 0 dislike
Expected value and variance for Y

2 Answers

0 like 0 dislike
0 like 0 dislike
Use the facts that:

E(aX_1+bX_2)=aE(X_1)+bE(X_2)

Var(aX)=a^2 Var(X)

Var(X_1+X_2)=Var(X_1)+Var(X_2) for independent X_1, X_2
0 like 0 dislike
0 like 0 dislike
E(Y)=E(X1)-E(X2)=0

Var(Y)=Var(X1)+Var(X2)

No related questions found

24.8k questions

103k answers

0 comments

33.7k users

OhhAskMe is a math solving hub where high school and university students ask and answer loads of math questions, discuss the latest in math, and share their knowledge. It’s 100% free!