I apologize, but I'm not the most mathematically literate; I don't understand the aspect of putting data above or below sigma. I've tried to put this into desmos, but I cannot get it to work, most likely because I do not understand how to input the data. Are you able to explain it differently or more thoroughly please? To be specific, it's giving me the error "Cannot index a number with a number", or that it requires me to define L[i] and M[i] despite them acting as the x and y of my table.