FlyUs Airlines is unhappy with the number of empty seats on its New York to Philadelphia flight. To remedy the problem, the airline is offering a special discounted rate of $89 instead of the normal $169, but only for 7-day advance purchases and for a limited number of seats per flight. The aircraft flown from NY to Philly holds 100 passengers. Last month’s distribution of full-fare passengers is shown below. How many seats should FlyUs reserve for full-fare passengers?
Full-Fare Frequency
50 ..............15
55 ..............20
60 ..............35
65 ..............20
70 ..............10