Relation between drift velocity & conductivity of a doped semiconductor
Taking a stab at ths- and it's been a while- I'm thinking that your supposed to divine the dopant concentration from the minority carrier mobility, then use \$\mu_p\$ at that concentration for the majority carrier mobility \$\mu_p\$, so around \$3\times 10^2\$, so you'd get a considerably smaller conductivity number.