An small commuter airport has 11 gates. Planes arrive at the airport, on average, every 5 minutes during the morning rush. This interarrival time is exponentially distributed. They "turn", on average, every 30 minutes. That is to say, that the aircraft is unloaded, groomed, and reloaded in 30 minutes. The standard deviation for turn-time is 7 minutes.

What is the coefficient of variation for inter-arrival time? Report your answer to the nearest first decimal place.