The answer is 1/3 because if you count what you have to roll compared to how many dice you get your answer
A scatter plot (also called scatterplot, scatter graph, scatter chart, or scatter diagram) is a type of plot or mathematical diagram using Cartesian coordinates to display values. For typically two variables for a set of data. Is the points are coded (color/shape/size), one additional variable can be displayed. The data are displayed as a collection of points, each having the value of one variable determining the position on the horizontal axis and the value of the other variable determining the position on the verticals axis.
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9-n would be the proper equation