The orbitals which have electron density along the axis are all the $p$-orbitals $\left(p_x, p_y\right.$ and $\left.p_z\right)$ while, out of five $d$-orbitals only two $\left(d_{x^2-y^2}\right.$ and $\left.d_{z^2}\right)$ have electron density along the axis.

Therefore, the total number of given orbitals which have electron density along the axis is 5.