The cumulative distribution function of a discrete random variable X is given by

Then $\mathrm{E(X^2)=}$

A five digit number divisible by 3 is to be formed using the digits $0,1,2,3,4,5$ without repetition, then the total number of ways this can be done is

The statement $\sim(p \leftrightarrow \sim q)$ is

If $x=-1$ and $x=2$ are extreme points of $f(x)=\alpha \log |x|+\beta x^2+x$, then