Next Unoccupied seats on flights cause airlines to lose revenue. Suppose a large airline wants to estimate its average number of unoccupied seats per flight over the past year. To accomplish this, the records of 239 flights are randomly selected and the number of unoccupied seats is noted for each of the sampled flights. The sample mean is 14.7 seats and the standard deviation is 5 seats. Construct a 98% confidence interval for the population mean number of unoccupied seats per flight during the past year. Round your answers to one decimal