Consider the mathematics formula, Z=XY. When plotted on a 3D graph, the function gets very large very quickly.
Consider that Z is risk and that X is severity and that Y is probability. Then this formula is saying that severity and probability are multiplied, they are not added or otherwise combined mathematically.
If this Z=XY then risk is a very rapidly increasing number. That means that unresolved safety risks are very dangerous.
Plot this graph on your own graphing program. But remember to use only the positive part of the graph, that is, the positive values of X and Y. This will yield just the positive values of Z, that is, just the positive values of Risk, since mathematically, these are the values which make sense in reality.
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