(a)[3]
Find the probability that over 4 cars arrive in a 20-minute interval.
(b)[4]
Use an approximating distribution to determine the probability that the number of cars arriving in a 12-hour period lies between 150 and 160 inclusive.
(c)[3]
Find the probability that, in a 10-minute period, the total number of cars and trucks arriving at the fuel station is greater than 3 and less than 7.