$A$ coin is tossed successively three times. The probability of getting exactly one head or $2$ heads is:

The probability that a bomb will miss the target is $0.2$. Then the probability that out of $10$ bombs dropped,exactly $2$ will hit the target is:

$A$ pair of dice is thrown $6$ times. What is the probability of getting a $4$ exactly seven times?

$A$ binomial random variable $X$ satisfies $9 \cdot P(X=4) = P(X=2)$ when $n=6$. Then $p$ is equal to

In a binomial distribution,the probability of success is $\frac{1}{4}$ and the standard deviation is $3$. Then,its mean is

$A$ bag contains $4$ red and $3$ black balls. One ball is drawn and then replaced in the bag and the process is repeated. Let $X$ denote the number of times a black ball is drawn in $3$ draws. Assuming that at each draw each ball is equally likely to be selected,the probability distribution of $X$ is given by: