Question: Overbooking of airline seats has now become a major problem for everyone who flies, because in order to stay profitable despite rising fuel costs, airlines now fly at an unprecedented average seat occupancy of 85%.18 The following are the results, occupancy rates and counts, for some flights. Assume these data represent a random sample, and test the assumption that occupancy rates are normally distributed given that the mean is 85% and the standard deviation is 5%.
Range (%): 65-70 71-75 76-80 81-85 86-90 91-95
Count
(number of flights): 21 18 11 9 5 4