There's no maths in STAT170, i dropped maths in year 10 and was awful at maths, but i found STAT170 to be one of my favourite/ easiest units for first year. They give you a formula sheet in the tests/exams for every formula you need to know, the hardest thing about stat is just figuring out what the question is asking you to do and which formula to use. Once you figure that out you just look it up on the formula sheet and pick out the variables that are needed for the formula and attach them to the right data (e.g. μ), then just plug the formula into the calculator with your data and you are doing stats. You can also take in one A4 page with notes on both sides into the final exam.
So don't waste time memorising formulas, just understand what they represent and what specific words in questions signify to you that you need to use this specific formula instead of a different one etc etc, STAT kind of felt like a reading comprehension subject to me more than anything.