That's what spreadsheets were invented for. Just download libreoffice (free and much better than the bloated microsoft products), open Calc, import csv, put in the formula you need, drag it all the way down and there you go. No need to calculate anything yourself.
I use Apache openoffice for many years now. I am rather good with the ''doc'' part of it. But spreadsheets...Uh, not so much because I haven't had to use them much. In fact, only very rarely. So, it took me quite some time to figure out how it works. You make it sound more easy than it actually was -- at least for me. I still haven't figured it out completely. However, I got it done eventually.
(Confession: I am a boomer, not a digital native)
