If $8$ coins are tossed simultaneously,what is the probability of getting at least $6$ heads?

$A$ dice is thrown $10$ times. If getting an even number is considered as a success,then the probability of $4$ successes is:

The probability that event $A$ happens in a trial is $0.4$. If three independent trials are made, then the probability that $A$ happens at least once is.......

Let $X \sim B(n, p)$. If $E(X)=5$ and $\operatorname{Var}(X)=2.5$,then find $P(X < 1)$.

$7$ coins are tossed simultaneously and the number of heads turned up is denoted by the random variable $X$. If $\mu$ is the mean and $\sigma^2$ is the variance of $X$,then $\frac{\mu \sigma^2}{P(X=3)}=$

The binomial distribution whose mean is $9$ and whose standard deviation is $\frac{3}{2}$ is equal to