Hi - I got in to McGill's MScPH with low grades in calculus and statistics:
Differential Calculus - 74%, B letter grade
Integral Calculus - 60%, C letter grade
Intro Statistics - 76%, B+ letter grade
I just finished my MBA, and had to take a statistics for business class (which was very basic compared to my undergrad intro to stats course) and got 91% (A+), although I'm not sure if this was counted as part of my application (since the info on McGill's website says "undergraduate" calculus/stats courses).
Feel free to PM me if you'd like to chat more!