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October 12th, 2010, 07:13 AM  #1 
Newbie Joined: Dec 2009 Posts: 7 Thanks: 0  i.i.d. distribution and its expected value
Z_1,Z_2,Z_3 are the Independent and identically distributed random variables on N(0, 1). What is the expected value of E(Z_2Z_1Z_2+Z_3)? I have no idea at all, help me plz. 
October 12th, 2010, 08:38 AM  #2 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: i.i.d. distribution and its expected value
What does E(AB) mean?

October 14th, 2010, 06:52 AM  #3 
Newbie Joined: Sep 2010 Posts: 8 Thanks: 0  Re: i.i.d. distribution and its expected value
sorry i also have some question ask how to solve this problem ,give me some clue.... If X~ N(240,64) find a)m such that p(l X240 l <m)=0.80 B)r such that P( l X240 l >r) = 0.08 

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distribution, expected, iid 
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