We will now calculate the coefficient of quartile deviation for mathematics and geometry using the formula of quartile deviation, Q3 minus Q1 divided by Q3 plus Q1, and we see that coefficient of quartile deviation for both Geometry and Mathematics is similar. I hope this tip saves someone else the hours it took me to figure it out, because the solution is very simple. However, those two years at Salamanca, plus his long period of training and experience as a notary, firstin Seville and later in Hispaniola, would give him a close acquaintance with the legal codes of Castile that helped him to justify his unauthorized conquest of Mexico.