Product of expectations?

  • Thread starter zli034
  • Start date
  • #1
zli034
107
0
say, E(1/x)=a and E(y)=b. a and b are constants and x and y are random variables.

Can I say E(y/x)=b/a? Thanks.
 

Answers and Replies

  • #2
mathman
Science Advisor
8,059
540
Only if x and y are independent. If not, anything can happen - simple example y=x.
 
  • #3
zli034
107
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cool
 

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