Offwego Airlines has a daily flight from Chicago to Las Vegas. On average, 15 ticket holders cancel their reservations, so the company intentionally overbooks the flight. Cancellations can be described by a normal distribution with a mean of 15 passengers and a standard deviation of 4.50 passengers. Profit per passenger is $85. If a passenger arrives but cannot board due to overbooking, the company policy is to provide a cash payment of $185. Use Table B. How many tickets should be overbooked to maximize expected profit? (Round your z value to 2 decimal places. Round your other intermediate calculations to 4 decimal places and final answer to the nearest whole number.)