When it comes to singing, can teenage girls sing better than teenage boys?

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Do girls have a much more better singing voice than boys?

I'm asking cause on this TV show "The Voice" that air's on NBC, it seems like the judges love to pick teenage girls who have a great voice, but they rejected the teen boys, and I thought the boys had a great voice as well. The only male contestants that's competing on "The Voice" are the guys who are legal adults, but all the underage boys where turn down by the judges. Those boys were robbed.
When it comes to singing, can teenage girls sing better than teenage boys?
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