Guy's Behavior

Is it normal to be greeted and waved at by a girl from the same college class?

I left the campus at a break and I was looking for a market on the street but a girl from my class called my name and greeted me by waving her hand. It is all ok but we are not close friends we're not even talking to each other. Isn't it weird that she greets and waves a hand at the guy in the same class by calling his name when he is not his close friend and they are not even talking to each other.

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Is it normal to be greeted and waved at by a girl from the same college class?
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