Between 9 AM and 10 AM, the average number of phone calls per minute coming into the switchboard of a company is 4. Find the probability that in one particular minute there will be either 2 phone calls or no phone calls (given $e^{-4} = 0.018316$)

If $p$ is increased for a fixed $n$; the Binomial distribution shifts to the

The variance of a binomial distribution with parameters $n$ and $p$ is:

An example of a bi-parametric discrete probability distribution is

Probability distribution may be

The mean of the Binomial distribution $B(4, 1/3)$ is equal to

The probability that a student is not a swimmer is $1/5$ then the probability that out of five students four are swimmer is