Westsouth Airline flies the route Los Angeles and Oakland. The mean number of passengers per flight is 160 with a standard deviation of 20. The aircraft used for the route has 200 seats.

a. What percent of the flights are sold out?

b. The airline must sell 150 seats to break even on this particular flight. On what percent of the flights does the airline make money?

c. The airline would like to reduce the number of flight attendants on 20% of the flights. This will be done on the flights with the fewest passengers. Below what number of passengers on a flight will the airline reduce the number of flight attendants?