A good example of a bell curve or normal distribution is the roll of two dice. The distribution is centered around the number 7 and the probability decreases as you move away from the center. Here are the % chance of the various outcomes when you roll two dice.
main argument definition, main argument meaning | English dictionary. [. 1 chief or principal in rank, importance, size, etc. 5 a principal pipe, conduit, duct, or line in a system used to distribute water, electricity, etc.
contention-a point asserted as part of an argument. assertion, asseveration, averment-a declaration that is made emphatically (as if no supporting evidence were necessary). submission - (law) a contention presented by a lawyer to a judge or jury as part of the case he is arguing.