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We have measured the counts-in-cells fluctuations of 268 Lyman-break galaxieswith spectroscopic redshifts in six 9 arcmin by 9 arcmin fields at z~3. Thevariance of galaxy counts in cubes of comoving side length 7.7, 11.9, 11.4h^{-1} Mpc is \sigma_{gal}^2 ~ 1.3\pm0.4 for \Omega_M=1, 0.2 open, 0.3 flat,implying a bias on these scales of \sigma_{gal} / \sigma_{mass} = 6.0\pm1.1,1.9\pm0.4, 4.0\pm0.7. The bias and abundance of Lyman-break galaxies aresurprisingly consistent with a simple model of structure formation whichassumes only that galaxies form within dark matter halos, that Lyman-breakgalaxies' rest-UV luminosities are tightly correlated with their dark masses,and that matter fluctuations are Gaussian and have a linear power-spectrumshape at z~3 similar to that determined locally (\Gamma~0.2). This conclusionis largely independent of cosmology or spectral normalization \sigma_8. Ameasurement of the masses of Lyman-break galaxies would in principledistinguish between different cosmological scenarios.Comment: Accepted for publication in ApJ, 16 pages including 4 figure

A Counts‐in‐Cells Analysis of Lyman‐Break Galaxies at Redshiftz∼ 3