how to write expectation in x what is the density of the expectation? what is x=mathrm what is the expectation? what is the density of $x$? when calculating expectation of the value what is expectation in math what is expectation in mathrm what is expectation of x what is the density of expectation what is the density of $x$ what is the expectation of f(x)$? what is the assumption if x+n is a quantum what is $f(x)$ what is the expectation nf(x+n)x what is the expectation? what is the expectation what is expectation used for how to write expectation with nf(x+n)f(x+n)f(x+n)f(x+n) if the expectation is zero how is the expectation calculated