BITS Pilani does not offer any such course, although they offer an M.Sc degree in Mathematics.

Maths taught in BITS Pilani is not at all related to the likes of ISI Kolkata. The course curriculum at BITS Pilani is a lot theoretical and conceptually based. However, they have some of the subjects related to Statistics such as Probability and Statistics, Optimisation, Operation Research. But these are common courses to all of the disciplines.

Thus, even if you take up any different discipline, you will get to learn all these.