It depends on the hamburger. Fat is less dense than muscle, so not only does lean hamburger produce a dry, tasteless burger (at a premium price!) but you get fewer cups per pound, Fat, juicy Hamburgers shrink a little more,
Most of the shrinkage comes from water, however. Ice is added as hamburger is ground, providing (among other things) extra profit for the butcher shop.
In any case, the answer is "roughly two cups".
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