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I've seen a question:

> なんで **だろう** ？

I know that なんで means 'why'. So what about だろう?
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2016-03-24T00:53:58.627
33090
2016-03-24T01:40:28.810
2016-03-24T01:39:51.650
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question
word-usage modality
What is the function of だろう?
だろう is a short form of でしょう ("one supposes").  
Hence I read "なんでだろう" as "I wonder why" or "Why, do you suppose?"
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2016-03-24T01:27:46.270
33091
2016-03-24T01:40:28.810
2016-03-24T01:40:28.810
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answer