The moduls of the 30 ECTS minor are typically visited as follows: MAT141 in the 3rd, STA110 and STA120 in the 4th, STA121 and an elective in the 5th and missing electives in the 6th semester.
We do not check your transcripts and it is up to you if you would like to take the endeavor. It is possible but we do not recommend it.
Some chapters of STA120 rely on linear algebra and thus the canonical sequence helps to fully profit from the presented content. It is your responsibility to learn and assimilate the missing concepts of linear algebra as the semester progresses.
Yes, it is possible.