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Forum index » Science and Technology » Math » Probability
is it correct?
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VijaKhara@gmail.com
science forum beginner


Joined: 30 Sep 2005
Posts: 26

PostPosted: Sat May 27, 2006 1:37 pm    Post subject: is it correct? Reply with quote

Dear all
Today I read the book and the author deduces that
E(x^2)=0---> P(x=0)=1//

I cannot understand why he got this result.
What do u think?

Thanks
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VijaKhara@gmail.com
science forum beginner


Joined: 30 Sep 2005
Posts: 26

PostPosted: Sat May 27, 2006 1:46 pm    Post subject: Re: is it correct? Reply with quote

all that I deduce is only following:
P(x=k)=0 if k!=0
for x=0, P(x=0) can be take any values <1 and E(x^2) is still equal
zero.
Plz confirm for me.

Thanks
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VijaKhara@gmail.com
science forum beginner


Joined: 30 Sep 2005
Posts: 26

PostPosted: Sat May 27, 2006 1:48 pm    Post subject: Re: is it correct? Reply with quote

Oh my second post is wrong, plz answer my first question. Thanks
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Mike1170
science forum addict


Joined: 17 Sep 2005
Posts: 74

PostPosted: Mon May 29, 2006 4:58 am    Post subject: Re: is it correct? Reply with quote

<VijaKhara@gmail.com> wrote
Quote:
Dear all
Today I read the book and the author deduces that
E(x^2)=0---> P(x=0)=1//
I cannot understand why he got this result.
What do u think?
All of the probability "mass" must be at x=0 for E(x^2) = 0.
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