You can follow the rule "5 and above, give it a shove, 4 and below, let it go" which means that any number above 5 is to round the number next to it up on and any number that is 4 and below is to not do anything to the number next to it.
I am not sure but I do know that you need to have coordinates points in order to be able to graph... so there for you have to make an x/y chart in order to know here to graph...