How can expectation of position^2 be > L

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How can position^2 expectation be greater than the Length of "box"? I mean <x^2> = L^2 / 3. Say L=100m then we have <x^2> = 333m. How is this possible?
 
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Why should it not be possible? After all, ##100^2>100##. In any case the square is not comparable to the length, as the units of one is square metres and of the other is only metres. The volume of a cube that is 10cm per side is more than 10 ##cm^3##.
 

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