Question

The mean of a binomial distribution is 30 and standard deviation 6. Calculate n,p and q

Answer 1

For binary distribution, the mean is always bigger than the difference

I.e., np> npq

Here the difference is greater than the mean (npq = 60) (np = 30) and npq divided by np, you will get q = 2, but q cannot be greater than 1. Thus we are not able to recognize the value of n for this distribution.