The binomial distribution describes the probability of having exactly k successes in n independent Bernoulli trials with probability of a success p in Example 541. Displaystyle f knpf n-kn1-p. 0 Heads 1 Head 2 Heads or 3 Heads.
1 n 4 k 1 p 035.
N X. P is the probability of success on any given trial. The binomial distribution formula is. P xnp n C x p x q n-x.