In a binomial distribution,the mean is $18$ and the variance is $12$,then $p = . . . . . .$

The mean and variance of a binomial distribution are $4$ and $2$ respectively. Then the probability of exactly two successes is

Tom and Jerry play a game of alternately throwing an unfair coin. The first one to get a head wins. If Tom starts the game,he has a $62.5 \%$ chance of winning. Suppose this coin is tossed $5$ times,then the probability of getting exactly $3$ heads is

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

An unbiased coin is tossed to get $2$ points for turning up a head and $1$ point for the tail. If three unbiased coins are tossed simultaneously,then the probability of getting a total of an odd number of points is

$A$ bag contains $2$ white and $4$ black balls. $A$ ball is drawn $5$ times with replacement. The probability that at least $4$ of the balls drawn are white is