Hello, when I study English, I see this sentence: 'The average American family produces three pounds of trash a day.' It's on my textbook and it's not composed by native-speakers. I wonder why they used 'the' in that sentence. Can I use 'an' instead? Because I think the sentence refers to a general American family, not a specific one. Or is it OK to use both? Are 'An average American family ...' and 'The average American family ...' both correct and do they have the same meaning? Thank you very much.