Please help with B

Problem 7. (10 points) Cars arriving for gasoline at a Shell station follow a Poisson distribution with a mean of 10 per hour. A. Determine the probability that over the next hour, only one car will arrive. Probability = 0.000454 B. Compute the probability that in the next 4 hours, more than 19 cars will arrive. Probability = Note: You can earn partial credit on this