Sounds like your tires are worn un-evenly. I used to see that allllll the time. You should generally rotate your tires every 6-8k miles or so depending on your driving. Sounds to me like the previous owner either never rotated them or very rarely. The dealership may have rotated them before you bought the car, then again maybe not. The other thing that affects tire wear is the alignment. Again, this should be done ever so often (optimum is every 15-17k) to avoid excessive wear and uneven wear patterns. I would rotate the tires and have the alignment checked. Take it back to the dealership and have them do that (they shouldn't charge you as a courtesy).
Without hearing your exact noise, it's hard to say for 100% certainty that the tires are creating that noise. The other posibility is a wheel bearing as previously mentioned. However, usually when wheel bearings are bad or beginning to fail you will hear it constantly while driving.
Just have those two things addressed and you should be fine and noise free.
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