A neutrino beam with E = 337 GeV is passed through a 68.5-cm-thick slab of aluminum-27 (with 27 nucleons in each nucleus). What fraction of the neutrinos will scatter off a nucleon if the cross section is given by σ(E) = (0.68∙10-38 cm2 GeV-1)E, (Aluminum has a density of 2.77 g/cm3.)