How to calculate E(Y), P(X = 1|Y = 2), and E(X|Y = 2)?
Thanks!
Let (X,Y) be a random vector such that f(y|x) = 1/3 if x=1,2,3 and f(y|x)=0 elsewhere?
2016-12-04 1:36 pm
回答 (1)
2016-12-04 1:50 pm
E(Y) = E( E(y/x) )
Compute E(y/x)
x f(y/x)
1 1/3
2 1/3
3 1/3
E(Y) = (1)(1/3)+(2)(1/3)+(3)(1/3) = 2
I am not sure if other queations can be answered without more information.
We need the joint probability distribution of x and y
Compute E(y/x)
x f(y/x)
1 1/3
2 1/3
3 1/3
E(Y) = (1)(1/3)+(2)(1/3)+(3)(1/3) = 2
I am not sure if other queations can be answered without more information.
We need the joint probability distribution of x and y
收錄日期: 2021-05-01 20:57:04
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20161204053659AAPLnO5