= Solution
The inferred parameters give $\lambda_D\simeq6.46\times10^{-11}$ m and $\boxed{N_D\simeq0.28}$, or $n_e\lambda_D^3\simeq0.067$ without the spherical factor. Neither is much larger than one. Thus a good classical weakly coupled <plasma (physics)>[plasma] approximation is not justified. Correlations, collisions and potentially degeneracy matter at this <density>; treating the preceding 18.7 eV as a reliable <temperature> measurement would overstate what this simple model establishes.
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