Importance of “officially” having Math/Stats Minor

A little context, I'm a CS student at the University of Washington, and I'm taking math + stats classes for fun. I was wondering how important it is to officially get math and/or statistics as minors (which may be difficult at my school due to competitive registration) or is just taking classes in these subjects enough. Also, I was wondering if I should take the stats classes before or after the math classes. Thanks in advance.