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Short Answer

Use the following information for questions:
Unoccupied seats on flights cause airlines to lose revenue. A large airline wanted to estimate its average number of unoccupied seats per flight. Based on a random sample of flights, the 95% confidence interval for mean number of unoccupied seats per flight was given as: (7.5, 9.5).
-What was the mean number of unoccupied seats per flight for the sample of flights?