I am a Mathematics and Chemistry major with a Physics minor. I need to take one more mathematics elective course next semester. I had two picked out but both unfortunately overlap with other classes I am taking, so I am now trying to choose between Probability or Mathematical Statistics (course descriptions below). I am currently applying for Physics graduate programs, and am hoping to learn more about quantum mechanics and related branches of physics like statistical mechanics, quantum field theory, and string theory in the future. Does anyone have an opinion on which course would be most useful for understanding those subjects? Course Descriptions: Probability: Probability in discrete and continuous sample spaces; conditional probability; counting techniques; probability functions; binomial, Poisson, normal distributions; and transformations of variables. Mathematical Statistics: Normal, chi-square, t, and F distributions; estimation; hypothesis testing; regression and correlation; analysis of variance; nonparametric statistics; and introduction to Bayesian inference.