We calculate the concentrations of vacancies and interstitials in the ground state of a Bose solid which models 4He. Because ground-state boson wave functions are nodeless, their probability densities correspond to classical Boltzmann factors, and properties of Bose solids, such as the concentration of vacancies and interstitials, can be calculated using classical statistical mechanics. We model the ground-state wave function of 4He with the product (Jastrow) form that corresponds to a classical l/r h pair potential, and use a quasiharmonic approximation to calculate the concentrations of vacancies and interstitials in an fcc lattice with this potential.