The mean of a binomial distribution is 10 and its standard deviation is 2, write the value of q.

In a group of 200 items, if the probability of getting a defective item is 0.2, write the mean of the distribution.

If the mean of a binomial distribution is 20 and its standard deviation is 4, find p.

If the mean and variance of a random variable X having a binomial distribution are 4 and 2 respectively, find P (X = 1).

If the mean and variance of a binomial variate X are 2 and 1 respectively, find P(X > 1).