Explanation : Binomial Distribution: The binomial distribution is usually exemplified by flipping a coin. The result can have only two outcomes, heads or tails, each of which has equal probability. The probability of either outcome remains the same throughout the experiment. The binomial distribution therefore describes the probability that in a finite number of trials (coin flips), there will be a specified number of heads (successes) or a specified number of tails (failures). The general form of the binomial distributions is
where n is the number of trials, r is the number of successes.