Practice lab probability distributions

The equation for the Gaussian directly below section 4.2 is having a factor (1/2) too much.

On a completely unrelated note, it could be useful to have either scipy.special.comb and/or math.factorial imported by default in the lab, otherwise everybody enrolled in the course needs to manually modify the package imports for one of these.

Hi @Bastian_Proxauf,

The (1/2) was removed, thanks for flagging this! Also, thanks for the suggestion, this makes a lot of sense, we have implemented it and now the functions are already imported by default :slight_smile:.