I don't really know where to begin.
1. idea: For a spatial wave funtion I'd have to calculate the integral over dxdydz for -inf to +inf. But that doesn't seem very reasonable to me here.
$$\int \chi dxdydz=\int A\begin{pmatrix}
3i\\
4
\end{pmatrix} dxdydz$$
Do have to substitute dxdydz with...