For a certain type of mobile, the length of time between charges of the battery is normally distributed with a mean of 50 hours and a standard deviation of 15 hours. A person owns one of these mobiles and want to know the probability that the length of time will be between 50 and 70 hours is (given $q(1.33) = 0.9082, q(0) = 0.5$)?

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