Two cards are drawn successively with replacement from a well shuffled pack of 52 cards. Then mean of number of kings is

The probability that at least one of the events $$E_1$$ and $$E_2$$ occurs is 0.6. If the simultaneous occurrence of $$\mathrm{E}_1$$ and $$\mathrm{E}_2$$ is $$0.2, \mathrm{P}\left(\mathrm{E}_1^{\prime}\right)+\mathrm{P}\left(\mathrm{E}_2^{\prime}\right)=$$

Two dice are thrown simultaneously. If X denotes the number of sixes, then the expectation of X is

The probability distribution of a random variable X is

then Var(X) =