It's not an either/or thing. Statistical methods use calculus as a tool. Let's say someone handed you a pile of data on some event that fires after some random

It's not an either/or thing. Statistical methods use calculus as a tool. Let's say someone handed you a pile of data on some event that fires after some random time (earthquakes, light bulbs burning out, bacteria lifetime, etc). You're tasked with figuring out the probability that event is going to happen whenever. How would you do that? You would probably say, oh that's easy! Add up each lifetime of each event that happens before whatever time, and divide by total number of events. Congratulations, you just did calculus.