The following data are for intrinsic germanium at 300 K.

${\mathrm{n}}_{\mathrm{i}}=2.4\times {10}^{19}/{\mathrm{m}}^3$ , ${\mathrm{\mu }}_{\mathrm{e}}=0.39{\mathrm{m}}^2/\mathrm{Vs},$${\mathrm{\mu }}_{\mathrm{h}}=0.19{\mathrm{m}}^2/\mathrm{Vs}$ . Calculate the conductivity of intrinsic germanium.