P probability of success in one trial. N P n C x P x 1 P n x. What is the probability that the coin lands on heads 2 times or fewer.
The probability of obtaining x successes in n independent trials of a binomial experiment is given by the following formula of binomial distribution.
And that makes sense because the probability of getting five heads is the same as the probability of getting zero tails and the probability of getting zero tails should be the same as the probability of getting zero heads. What is the probability that the coin lands on heads 2 times or fewer. 3 2 0. The random variable X has a binomial distribution with index n 5 and parameter th 0.