A binomial experiment consists of n identical trials with probability of success p on each trial. The binomial formula that follows can be used to find the probability of exactly k successes in n trials, where q = 1 - p. P(x = k) = Cpkq -k n! = pkan-k k!(n-k)! Here, we are to find P(2 x 4), which can be thought of as P(x = 2) + P(x = 3) + P(x = 4). We are given n = and p = 0.3, so q = 1 p = 10.3 = . The value of k will change with each probability statement. and when calculating When calculating P(x = 2), k = 2. When calculating P(x = 3), k = P(x = 4), k = 6