The quadratic equation $x^2 -ax+ b = 0$ is known to have two real roots, $X_1$ and $X_2$ $(X_1 > X_2)$ but the coefficient $b$ is a positive unknown and can be assumed to have a uniform distribution in the permissible range of variation. Then what is the expected value of $X_1$.
I found that the roots have terms $a$ and $b$ in it. I took its expectation. But nothing is known about $a$ and it is just mentioned that $b$ follows uniform distribution but range is not specified. So how do l find the expectation.