Experience the Tour de France (ETF) is a specialty travel agent. They arrange vacations for amateur cyclists who want to experience the Tour de France by riding through one or more stages in the race. They have 4 people who take calls from clients. Each call lasts on average 20 minutes with a standard deviation of 60 minutes. A call arrives on average every 15 minutes with a standard deviation of 15 minutes.(Round your answer to 2 decimal places.)
On average, how many minutes does a caller wait before talking to an agent?