They know a little calc before they get into physics. And they often tell me about how they used it in my calc class.
But, what I wish we could do is stop treating Statistics like it's... the math class for "weak" students who couldn't do calculus.
Part of the problem is there is still a tendency to classify kids as "math people" and "not math people" although I'm breaking my peers of this notion every chance I get. Part of it is this snobbishness pure math people have about stats.