At the end of last year, the legal arm of a large commercial airline issued a document that included statements about the flight experience of the airline's pilots (the total flying time per pilot). To check these statements, a federal watchdog organization examined the flight records of a random sample of 30 of the airline's pilots. The pilots in the sample, as of the end of last year, had a sample mean experience of 3214 hours with a sample variance of 85,292 hours$^2$.
The airline's document stated that, at the end of last year, the airline's pilots had a population mean experience of 3345 hours of flight with a population variance of 84,324 hours$^2$.
Fill in the blanks below with the proper notation for the population mean, the population variance, and the sample mean.
Population mean: (Choose one) = 3345 hours
Population variance: (Choose one) = 84,324 hours$^2$
Sample mean: (Choose one) = 3214 hours
