Mathematics and statistics opens doors to many careers. Unlike programming jobs which are being outsourced, jobs which require mathematical ability are actively sought in major corporations in the US. I wish I had gone into this. The con is -- you must like and be good in mathematics. The occupation can be sedentary, and if you like something physical, as opposed to mental, it can be demanding and even boring. I recommend taking as much statistical and Operations research course work as possible and working in an organization that needs to solve real problems through analysis of data. This will motivate the application of the science to find a tangible solution.
It's a steady and always in-demand job. The money is pretty good, but it won't make anyone rich. People who are considering this had better enjoy long days staring at columns of data - it can get tedious and boring at times.