I red griffiths many times but even now there is something I can't understand. It's about statistical interpretation. In his book chapter 3.4 he says(adsbygoogle = window.adsbygoogle || []).push({});

"If you measure an observable Q(x,p) on a particle in the state ψ(x,t), you are certain to get one of the eigenvalues of the hermitian operator Q(x,-ihd/dx)"

but when the particle is not in determinate state (I mean <σ^2>=0), we can't even get eigenvalue equation Qψ=qψ. So we don't know whether the observable is a eigenvalue of some eigenvalue equation or not.

Could you please explain the sentence above to me?

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# Generalized statistical interpretation

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