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Math Forum » Discussions » sci.math.* » sci.stat.math.independent

Topic: 2nd (raw?) moment of uniform PDF
Replies: 2   Last Post: Feb 15, 2013 6:26 PM

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quasi

Posts: 9,774
Registered: 7/15/05
Re: 2nd (raw?) moment of uniform PDF
Posted: Feb 14, 2013 8:38 PM
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Paul wrote:
>
>The papers states that the second moment of X~U(a,b) is:
>
> E(X^2) = ( b^3 - a^3 ) / 3(b-a)
>
>My own integration of x^2 from a to b yields (b^3-a^3)/3.
>
>Can anyone point out where Hauptmanns's extra normalization
>factor 1/(b-a) comes from?

The probability mass function is 1/(b-a).

quasi

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