And you said on average there are 9.3 cars per hour and you feel that's a pretty good estimate. So that's what you have there. And let's see what we could do. We know the binomial distribution. The binomial distribution tells us that the expected value of a random variable is equal to the number of trials that that random variable is kind of composed of. Before in the previous videos we were counting the number of heads in a coin toss. So this would be the number of coin tosses times the probability of success over each toss.