If the random variable X follows a binomial distribution with parameters n and P,then when using the normal distribution to approximate the distribution of X,we should use nP for the mean and nP(1-P)for the standard deviation.

Question

Quizplus · Accepted Answer

The mean of a binomial distribution is nP, but the standard deviation is the square root of nP(1-P), not nP(1-P) itself.

If the Random Variable X Follows a Binomial Distribution with Parameters