When success is not an impossible event,then the mean of Binomial distribution is

If in $6$ trials, $X$ is a binomial random variable which follows the relation $9P(X = 4) = P(X = 2)$, then the probability of failure is...

In a university campus, the probability that a person chosen at random is an engineering student is $\frac{1}{5}$. The probability of having at most two engineering students in a sample of $8$ people is:

Two cards are drawn successively with replacement from a well-shuffled pack of $52$ cards. Let $X$ denote the random variable of the number of jacks obtained in the two drawn cards. Then $P(X=1) + P(X=2)$ equals

If a fair coin is tossed five times,then the probability of getting exactly three heads is . . . . . . .

For a binomial distribution with mean $6$ and variance $2$,the value of $P(X = 8)$ is