My Math Forum i.i.d. distribution and its expected value

 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_2|Z_1-Z_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(A|B) 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 X-240 l r) = 0.08

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