n = The number of trials
x = The number of successes
p = The probability of success
q = The probability of failure (which is 1 - p)
The binomial distribution describes the behavior of a count of variable X if the following conditions apply: Binomial Distribution Formula
What is Binomial Distribution?
Binomial Distribution Explanation
The following is a really good explanation of how to calculate Binomial Distribution. It takes a moment for the instructor to begin his example.