AS/A2 Stats 1 Stats 3

S2 Topic 1: Binomial and Poisson distributions
Binomial mean and variance
Choose values for n and p and all the probabilites will be calculated, together with the mean and variance of the distribution.

n: p:
mean = np =	variance = np(1-p) =

Summary The Binomial distribution has two parameters, n and p. p is the probability of success n is the number of trials The distribution is perfectly symmetric when p = 0.5 mean = np variance = np(1-p) © MathsNet 2001