**9. Correct. The answer is
false. **Let X be
a random variable which represents the number of cars that arrives to the gas station
in 12 minutes. X follows a Poisson distribution whose average value is:
24*(12/60) = 4.8. In this particular case, the distribution function is:

P[X = x| λ =
4.8] = (4.8)^{x}e^{-4.8}/ x!

P[X = 5 | λ =
4.8] = (4.8)^{5}e^{-4.8}/ (5!) = 0.1747

There is a probability of 17.47% that exactly 5 cars arrive to the gas station in 12 minutes.