I am retaking physics I, this time calculus based, and my professor did a horrendous job at explaining the material. I don’t fully understand what proportional error is and whether or not it is any different than the standard deviation?

I don’t speak variable so I have no idea what an equation means if I just see: Sum((delta(a)/a)^2+delta(b)/b^2.

Thanks for the help. I know this has NOTHING to do with CoG, but I don’t feel like subscribing to another forum. Hopefully there’s a high level math wizard that reads this.