Final answer:
The expected value of a binomial distribution with a sample size of 100 and a success probability of 0.4 is 40.
Step-by-step explanation:
The expected value of a binomial distribution can be calculated using the formula E(X) = np, where n is the sample size and p is the probability of success on one trial. In this case, n = 100 and p = 0.4. Therefore, the expected value is E(X) = 100 x 0.4 = 40.