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Marcus Miller Jazz IV Japan

There's no way to know without weighing the actual specimen itself. Even within the same make and model of bass, individual instruments will vary widely because they are made of wood and wood is a natural product with a lot of variation in its density, even within the same species.

When you pay up for a very expensive bass that's made of the usual Fender-style woods -- ash and alder -- often what you are really paying for a is light and resonant piece of wood.

All that said, the Jazz bass is Fender's largest body, and most specimens these days seem to weigh in between 9 and 10 pounds.

Some sites online list specific weights of the instruments. Sweetwater is one. I know you asked about the 4 string, but here's a 5er that weighs 10 pounds:

http://www.sweetwater.com/guitargallery/electric/custom/sUS11044753/

I could see the 4 string weighing 9. Good luck!