What does the expectation and deviation of an operator mean??(adsbygoogle = window.adsbygoogle || []).push({});

The way I understood it was every observable has a operator to it and the expectation of the observable uses the operator to calculate the deviation ...

for ex :: <p>=integral( (si)* momentum operator (si) ) dx ..... so what does the standard deviation and expectation of an operator mean and is my understanding right??

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# Expectation of an operator

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