Take each of the following:
3460:209 Computer Science I 
3470:461 Applied Statistics (in place of 3470:401 Probability and Statistics for Engineers)
3450:307 Fundamentals of Advanced Mathematics
3450:312 Linear Algebra
3450:421 Advanced Calculus I
3450:427 Applied Numerical Methods I
3450:428 Applied Numerical Methods II
3450:436 Mathematical Models 
One of 3450:425 Complex Variables or 3450:422 Advanced Calculus II

Total: 27 Additional Credits

Minor: If you take 3470:461 Applied Statistics in place of 3470:401, then you'll need either 3450:312 Linear Algebra or 3450:438 Advanced Engineering Math I, as well as one additional approved elective from mathematics, statistics or computer science.