This is a very hard question to answer , as it would depend upon the average for a certain genre. I imagine if you were referring to ALL songs you could never know!
I personally play Classical Music and once (out of boredom) began counting the notes in my sheet music. I had reached several hundred after the first sixteen bars! So it really comes down to individual style and genre- and the gruelling task of counting it yourself. You might want to pick a lazy afternoon for that one ;)
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Really, you only need two, because a harmony implies that there are two "voices", but you can have as many notes as you want and have a lot of different voices.
That depends entirely upon whether you play it note by note or using chords. There are many songs that can be done with 2 chords.
Die Entführung aus dem Serail
on average there are 27
there are 7 notes
hindi ko rin alam..
Wikipedia notes that Ray Charles wrote a total of nine songs only.