How big is your average black hole?

How big is your average black hole?
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Answer :

answer:All you can measure is its motion and the effect it has on the surrounding space. To that end the most massive black hole to date is NGC 4889 and weighs in at somewhere in the neighborhood of 21 billion Suns. As far as infinitely dense, we have no knowledge of what lies beyond the event horizon, including if the laws of physics as we understand them hold up, which if they do can create a point of density (there’s your infinitely small) so great it begins to do very odd things to time and space; you might find this Discover article interesting.
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