**If I have two independent variables (say X and Y) with their respective variances (or standard deviation), how could I calculate the mean and variance of the resultant division of variable X from variable Y?**

I have come across some "first order Taylor series", but as a non mathematician it is fairly hard to me to follow up the explanations. Could someone recommend any literature? Thanks in advanceI have come across some "first order Taylor series", but as a non mathematician it is fairly hard to me to follow up the explanations. Could someone recommend any literature? Thanks in advance