A cafeteria serving line has a coffee urn from which customers serve themselves. Arrivals at the urn follow a Poisson distribution at the rate of $3\mathrm{.}0$ per minute. In serving themselves, customers take about $14$ seconds, exponentially distributed. What is the probability that three or more people are in the cafeteria?

Note: Do not round intermediate calculations. Round your answer to $1$ decimal place.